Domestic Standard Code

The addition of "/T" after the standard code indicates a recommended standard; the addition of "/Z" after the code indicates a guiding technical document, such as "YB/Z" representing the guiding technical document of the Ministry of Metallurgical Industry.
The standard code for Taiwan Province of China is CNS.
ZB is the former national professional standard, followed by letters A, B, C, ..., Y, indicating standards of different professions, such as ZBY for the former standard of instruments and meters of the Ministry of Machinery Industry. Some of these standards have been or are being changed to new standards.
No.  Standard Code  Standard Name
1     GB            Mandatory National Standard
2     GB/T          Recommended National Standard
3     GBn           National Internal Standard
4     GBJ           National Engineering Construction Standard
5     GJB           National Military Standard
6     TJ             National Engineering Standard
7     ZB             Former National Professional Standard
8     BB             Packaging Industry Standard
9     CB             Shipbuilding Industry Standard
10    CH             Surveying and Mapping Industry Standard
11    CJ             Urban Construction Industry Standard
12    DA             Archives Industry Standard
13    DL             Electric Power Industry Standard
14    DZ             Geology and Mining Industry Standard
15    EJ             Nuclear Industry Standard
16    FJ             Former Textile Industry Standard
17    GA             Public Security Industry Standard
18    GD             Former First Ministry of Machinery Industry Forging and Pressing Machinery Standard
19    GY             Radio, Film, and Television Industry Standard
20    GZ             Former First Ministry of Machinery Industry Casting Machinery Standard
21    HB             Aviation Industry Standard
22    HG             Chemical Industry Standard
23    HJ             Environmental Protection Industry Standard
24    HS             Customs Industry Standard
25    HY             Marine Industry Standard
26    JB             Machinery Industry Standard
27    JB/TQ          Former Machinery Industry Ministry Petrochemical General Standard
28    JB/GQ          Former Machinery Industry Ministry Machine Tool Standard
29    JB/ZQ          Former Machinery Industry Ministry Heavy and Mine Standard
30    JB/DQ          Former Machinery Industry Ministry Electrical Standard
31    JB/Z           Machinery Industry Guiding Technical Document
32    JC             Building Materials Industry Standard
33    JG             Construction Industry Standard
34    JJ             Former National Construction Committee, Ministry of Urban-Rural Development Standard
35    JT             Transportation Industry Standard
36    JY             Education Industry Standard
37    LD             Labor and Labor Safety Industry Standard
38    LY             Forestry Industry Standard
39    MH             Civil Aviation Industry Standard
40    MT             Coal Industry Standard
41    MZ             Civil Affairs Industry Standard
42    NJ             Former Machinery Industry Ministry Agricultural Machinery Industry Standard
43    NY             Agriculture Industry Standard
44    QB             Former Light Industry Standard
45    QC             Automotive Industry Standard
46    QJ             Aerospace Industry Standard
47    SB             Domestic Trade Industry Standard
48    SD             Former Water Conservancy and Electric Power Standard
49    SH             Petrochemical Industry Standard
50    SJ             Electronic Industry Standard
51    SL             Water Conservancy Industry Standard
52    SY             Petroleum and Natural Gas Industry Standard
53    SC             Aquatic Products Industry Standard
54    TB             Railway Industry Standard
55    WB             Material Industry Standard
56    WJ             Military Industry Civilian Products Standard
57    WM             Foreign Economic and Trade Industry Standard
58    WS             Former Ministry of Health Standard
59    XB             Rare Earth Industry Standard
60    YB             Ferrous Metallurgy Industry Standard
61    YD             Communication Industry Standard
62    YS             Non-ferrous Metallurgy Industry Standard
63    YY             Medical Industry Standard
64    YZ             Post Office Industry Standard
65    ZBY            Former Ministry of Machinery Industry Instruments and Meters Standard