Last updated: 29 September 2026.
Quick answer. GB is mandatory, GB/T is recommended and GB/Z is guidance. Only the GB tier must be complied with, and only for the products, processes or services it names. Each standard also carries two dates, published and effective, and the official full-text platform is where both are verified.
What GB, GB/T and GB/Z mean on a Chinese drawing: which tier is mandatory, how a standard's publication and effective dates differ, and where to verify it.
Everything here about the tier system, the published counts, the platform rules and the mandatory-standard procedure comes from the national standards full-text platform run by the State Administration for Market Regulation and the Standardization Administration of China, and from the text of the Administrative Measures for Mandatory National Standards (SAMR Order No. 25) as published on the Central People's Government website and the regulator's own site. All were retrieved on 29 September 2026 and are listed at the end.
A drawing, a product label or a material certificate coming out of China often carries a code like `GB 15210` or `GB/T 10004` instead of, or beside, an ISO, EN, ASTM or DIN reference. Buyers routinely treat the whole family as "the Chinese standards", assume they all bind the supplier equally, and then discover the difference at the wrong moment — usually during an inspection dispute or a customs question. If the code sits on the same drawing as an ASTM, CE or UL mark, this site's comparison of those three marks covers that side of the question; this page is about the Chinese side.
That assumption is wrong in a way that is easy to state precisely, because the Chinese authorities publish the distinction themselves. This page sets out which tier obliges the supplier, which one does not, why a standard that "exists" may not yet be in force, and where a buyer can check a code without paying a testing house.
The national standards full-text platform classifies national standards into three prefix families, and it prints the classification on its own home page. The counts below are the platform's own figures for standards currently in force, as retrieved on 29 September 2026.
| Prefix | The platform's own label | What the tier is | Standards currently in force, per the platform |
|---|---|---|---|
| GB | Mandatory national standard | Requirements that are obligatory within the scope each standard states | 2,031 |
| GB/T | Recommended national standard | Voluntary unless a contract, regulation or certification makes it binding | 47,164 |
| GB/Z | Guiding technical document | Guidance, not a requirement | 742 |
| (no single prefix) | National standards in foreign-language versions | Official translations of Chinese national standards | 2,638 |
Two structural points follow straight from the platform's own accounting, and both matter commercially.
The mandatory tier is small. Around two thousand mandatory standards against roughly forty-seven thousand recommended ones. A code that starts `GB/T` is, by default, not a legal obligation on anyone; a code that starts `GB` is.
The platform distinguishes standards that adopt an international standard from those that do not. Its home page reports the split: of the 2,031 mandatory standards, 1,691 are non-adopted and can be read online and downloaded, while 340 adopt an international standard and can only be read online; of the recommended standards, 31,144 are non-adopted and 16,020 are title-level only in this system. The adoption status is shown per standard in the platform's own results table, as a column. For a buyer this is the single most useful field on the page: it tells you whether the Chinese code you were quoted is an independent Chinese requirement or a national adoption of an international one, and those two are not the same thing to your technical file.
The tier label is not just a naming convention. Mandatory national standards are governed by their own regulation: the Administrative Measures for Mandatory National Standards, published as SAMR Order No. 25 on 6 January 2020 and in force from 1 June 2020. Its articles answer most of the questions a foreign buyer ends up asking, and the relevant ones are these.
| Question | What the regulation states | Article |
|---|---|---|
| What is a mandatory standard even for? | Mandatory national standards are made for technical requirements that safeguard human health and life and property safety, national security, and ecological environment safety, and for requirements needed to meet the basic needs of economic and social administration | Art. 3 |
| How broadly do they apply? | They follow a principle of generality, preferring standards that apply across fields and disciplines rather than to a single product line | Art. 4 |
| Do they copy international standards? | They shall adopt international standards in light of national conditions | Art. 6 |
| Who enforces them? | Every mandatory national standard must have a named department responsible for supervising its implementation, and a stated legal or regulatory basis for acting on violations | Art. 8 |
| Who approves them? | The State Council's standardization department manages the system, handles project approval, numbering and external notification; mandatory national standards are approved and issued by the State Council, or by authorization | Art. 9 |
| Can part of a mandatory standard be optional? | No. Its technical requirements are entirely mandatory, and must be verifiable and operable | Art. 19 |
| Who can propose one? | Provincial standardization departments, and also social organizations, enterprises, institutions and citizens | Art. 10 |
The practical reading for a buyer is narrow and useful. If the part you are ordering falls inside the product, process or service scope that a mandatory national standard names, the supplier is not free to sell you something non-compliant — and there is a named authority tasked with acting on it. If the code is a `GB/T`, that enforcement chain does not exist for it. When a Chinese supplier says "our standard does not allow this", the first question is which tier the code belongs to.
This is the point that catches the most orders, and the platform's own results table shows it directly. Every standard is listed with a publication date and a separate implementation date, plus a status field.
The mandatory-standard regulation explains why. When a mandatory standard is drafted, the drafting body must prepare a written explanation that includes a recommendation for the transition period between the publication date and the implementation date, covering how much technical modification and cost the change implies and how much time older products need to leave the market (Art. 21(6)). The explanatory materials submitted for approval must include that transition proposal (Art. 31).
An example lifted from the platform's own mandatory-standards listing on 29 September 2026 shows what this looks like in practice:
| Field | Value as listed |
|---|---|
| Code | `GB 15210-2026` |
| Subject (our translation of the Chinese title) | General technical specifications for walk-through metal detectors |
| Status | About to be implemented |
| Publication date | 27 August 2026 |
| Implementation date | 1 September 2027 |
A standard published in August 2026 that does not take effect until September 2027 is not a defect and not a delay. It is the transition period doing its job. For a buyer it means three things: a code appearing on a 2026 drawing may be a standard that manufacturers cannot yet be measured against; a supplier claiming compliance with a not-yet-effective standard is describing intent, not a verified position; and where a superseded standard is still listed as current, the implementation date of its replacement is what tells you when compliance expectations actually move.
Two official platforms carry this, and neither requires an account for the basic check.
Three rules from the full-text platform's own published statement decide whether the standard you want will actually be readable there:
One more field worth using: the platform classifies standards by ICS, the same international classification scheme used for ISO standards. If you already know the ICS range your part falls in, that is often a faster route to the relevant Chinese codes than guessing at titles.
Four limits, all of which follow from the sources above rather than from caution:
Where a Chinese code governs the drawing itself rather than the finished product, the practical companion pages on this site are general tolerances and how a drawing states them and materials and mill certification, both of which deal with codes that arrive on the same paperwork.
This checklist is our own, drawn from the sources above rather than published by any authority. It is what we would put in front of a supplier when a drawing arrives with Chinese codes on it.
If you want a Chinese manufacturer's position on a specific part set out against these fields, send the drawing and the code list through the quote form, and it will be returned with the tier, the dates and the adoption status for each code.
GB is the prefix for a mandatory national standard in China. It is not a brand and not a certificate. A code beginning GB names a standard whose requirements are obligatory within that standard's own stated scope, and the official full-text platform lists each one with its application status, publication date and implementation date.
No. GB/T is the recommended national standard tier, and the official platform labels it as such. Recommended standards become binding on a supplier through a contract clause, a regulation or a certification scheme rather than by their own force. Around 47,000 recommended standards were in force at the end of September 2026, against roughly 2,000 mandatory ones.
GB/Z is a guiding technical document, the third of the three prefix families the official platform uses. It is guidance rather than a requirement. The platform counted 742 such documents in force at the end of September 2026.
Use the official national standards full-text platform and read the status field and the two dates for that code. Each standard is listed with a publication date and a separate implementation date, so a code can be published and not yet effective. Note also that food safety, environmental protection and engineering-construction national standards are excluded from that platform and are handled by the ministries responsible.
No, and the two are administered separately. A standard states requirements; certification is a process that verifies a product against them. In China, compulsory certification is a distinct regime with its own mark, and a supplier citing a standard code has not thereby shown that any unit was tested or certified.
All sources retrieved 29 September 2026. This page is an independent reading of the sources listed; the official pages themselves are the specification.
| Fact used on this page | Source |
|---|---|
| S1 — The three prefix families and the platform's labels for them (mandatory national standard, recommended national standard, guiding technical document); the in-force counts of 2,031 GB, 47,164 GB/T, 742 GB/Z and 2,638 foreign-language versions; the adopted/non-adopted splits of 1,691 and 340 for GB, 31,144 and 16,020 for GB/T, and 283 and 459 for GB/Z; the ICS classification scheme; the search filters including status values current, about to be implemented, superseded and withdrawn | National standards full-text platform, run by the State Administration for Market Regulation and the Standardization Administration of China (retrieved 2026-09-29). Chinese-language source; all figures are the platform's own published counts https://openstd.samr.gov.cn/bzgk/std/index |
| S2 — The mandatory-standards listing and its columns (code, whether it adopts an international standard, title, status, publication date, implementation date); the example entry GB 15210-2026, status about to be implemented, publication date 27 August 2026, implementation date 1 September 2027 (the English title is our translation of the Chinese title, the Chinese is authoritative); the platform's statement that national standards issued after 1 January 2017 are published within 20 working days of the publication announcement; its statement that standards approved before 1 January 2017 are also published; its statement that food safety, environmental protection and engineering-construction national standards are not included in the system | National standards full-text platform, mandatory national standards listing (retrieved 2026-09-29) https://openstd.samr.gov.cn/bzgk/std/std_list_type?p.p1=1&p.p90=circulation_date&p.p91=desc |
| S3 — The recommended-standards listing confirming the same columns and the same published statements, and the in-force and pending status filters shown on the query page | National standards full-text platform, recommended national standards listing (retrieved 2026-09-29) https://openstd.samr.gov.cn/bzgk/std/std_list_type?p.p1=2&p.p90=circulation_date&p.p91=desc |
| S4 — The publication notices through which newly issued national standards are released onto the full-text platform | National standards full-text platform, notices page (retrieved 2026-09-29) https://openstd.samr.gov.cn/bzgk/std/nd |
| S5 — Administrative Measures for Mandatory National Standards, SAMR Order No. 25, published 6 January 2020, in force from 1 June 2020: Article 1 (made under the Standards Law); Article 3 (the purposes for which mandatory national standards are made, covering human health and life and property safety, national security, ecological environment safety, and the basic needs of economic and social administration); Article 4 (generality); Article 6 (adopting international standards in light of national conditions); Article 8 (a named implementation-supervising department and a legal basis for handling violations); Article 9 (central management, numbering and external notification; approval and issue by the State Council or by authorization); Article 10 (who may propose projects); Article 15 (public comment on the project of not less than 30 days, or generally not less than 7 in emergencies); Article 19 (all technical requirements mandatory, verifiable and operable); Article 21(6) (the transition period recommendation between publication and implementation); Article 23 (public comment of not less than 60 days, or generally not less than 30 in emergencies); Article 25 (WTO notification); Article 28 (technical review panel of not less than 15 people, drafters excluded); Article 30 (central numbering); Article 31 (approval materials including the transition proposal); Article 32 (30 days' notice for late submission, extension not exceeding one year) | State Council Gazette, 2020 No. 14, Central People's Government website (retrieved 2026-09-29) https://www.gov.cn/gongbao/content/2020/content_5512561.htm |
| S6 — The same regulation as released through the government policy document channel and through the regulator's own publication, used to cross-check the text and the order number | Central People's Government website, policy documents; State Administration for Market Regulation, regulations section (both retrieved 2026-09-29) https://www.gov.cn/zhengce/zhengceku/2020-01/14/content_5468984.htm |
| S7 — The regulator's own publication of the same regulation, used as the second cross-check of the article text | State Administration for Market Regulation, government information disclosure (retrieved 2026-09-29) https://www.samr.gov.cn/zw/zfxxgk/fdzdgknr/fgs/art/2023/art_55dfc4258efd4d0abd8392d8e407ec2b.html |
| S8 — The wider national standards registry, and its indexing of international and foreign standards including ISO, IEC, DIN and AFNOR, as named in its own interface | National standards information public service platform (retrieved 2026-09-29) https://std.samr.gov.cn/ |