How to Read a Chinese Standard Number: Prefix, Part and Year

A Chinese standard number normally combines a prefix, a serial number and an edition year; a multi-part standard may also include a part number. Read the complete identifier before searching or ordering. Small omissions, especially /T or a decimal part, can point you toward the wrong document.

The number is an identifier. It does not, on its own, establish the product scope, present status, document language or requirements applicable to your project.

Decode a real example: GB/T 17626.2-2018

The official record for GB/T 17626.2-2018 identifies an electrostatic-discharge immunity test document. It gives publication on 7 June 2018 and implementation on 1 January 2019. The part number identifies a specific document within the numbering structure, not a revision level or a test severity.

If a report cites only "GB/T 17626," ask for the part and edition. A series-level reference may be useful in discussion, but it is not sufficiently precise for ordering a particular text or agreeing a laboratory method.

Understand national prefixes

Article 32 of the National Standards Management Measures identifies GB as mandatory, GB/T as recommended and GB/Z as a guiding technical document. The number combines the code, serial number and publication year.

Use this classification as one field in your record, alongside the scope and the project's requirements. Do not shorten GB/T to GB in an email or purchase order. That is not harmless typography: it removes information from the identifier.

Industry codes need their own context

The Industry Standards Management Measures, effective from 1 June 2024, specify numbering with the industry code, /T, serial number and year. They also preserve legally prescribed exceptions to the general recommended classification.

Real catalogues contain historical and sector-specific identifiers that are not safely interpreted with one universal slash rule. For an unfamiliar industry code, retain the official spelling and consult the issuing department's record or announcement. Do not add /T yourself, and do not classify every industry number without /T as mandatory.

Recognize local and group numbering

The Local Standards Management Measures describe DB with regional administrative codes, followed by serial and year information. A provincial local-standard code uses the first two regional digits; a municipal code uses the first four. DBxx/T [serial]-[year] is a schematic illustration here, not a real standard to order.

Context matters: do not identify a document's region merely by noticing the letters DB. Verify its complete code and issuer in the official record.

The Group Standards Management Provisions describe a T/ code with the association identifier, serial number and year. The association segment is essential: the same serial digits used by different groups do not identify the same document. Group adoption is member-agreed or voluntary, rather than a national mandatory classification.

The year is not an implementation date or status

GB 38031-2025 was published on 28 March 2025, with an implementation date of 1 July 2026. A number ending in 2025 therefore does not tell you when implementation began.

Likewise, the year does not prove that a standard is current today. Check the official status, replacement information and amendments when selecting an edition. Keep historical identifiers intact when interpreting an older drawing or test report; then ask whether your new project needs a different edition.

Separate material designations from standard identifiers

A drawing may contain a material grade, a product model and a standard number in the same line. They serve different purposes. Ask the supplier which element identifies the material and which document defines its requirements; do not assume any alphanumeric token is a standard code.

For procurement, store the identifier as text rather than splitting it into a number that loses punctuation. Preserve the part and year in the order description, while keeping title and language in separate fields.

A reliable search and ordering checklist

1. Copy the complete code from the original reference.

2. Verify its title and issuer on the official standards information platform.

3. Compare part, edition, status and implementation date.

4. Confirm language and the exact file supplied.

5. Resolve any proposed substitution before purchase or testing.

Our national, industry, local and association directories can help you locate candidate documents. Always finish by checking the full identifier, rather than relying on a shortened search term.

Continue your document check

With the identifier intact, follow the standard-search workflow to compare candidates, then verify the document language and translation source.