The 2021 National Economic Industry Classification Code and the National Economic Industry Classification Conference were approved on March 25, 2019 and will be implemented on March 29, 2019.

The following shares the 2021 National Economic Industry Classification Code. Friends who want to know more, come and take a look at the 2021 National Economic Industry Classification Code 1 1. "National Economic Industry Classification" (GB/T 4754-2002) *** is divided into 20 categories

There are 95 major categories, 396 medium categories, and 913 small categories.

The categories are represented by English letters, arranged in the order of A, B, C; the major categories are represented by two Arabic numerals; the intermediate categories are represented by three Arabic numerals, the first two digits are the major category codes, and the third digit is the ontology of the intermediate category

Code; small categories are represented by four-digit Arabic numerals, the first three digits are the mid-category code, and the fourth digit is the ontology code of the small category.

2. In the coding, there are "other" items for the medium and small categories, and the code is represented by 9.

3. According to the principle of industry division, the main business activities (or main products) are the basis for classifying national economic industries.

Therefore, whether the main business activities are filled in accurately will directly affect whether the unit's industry classification is correct.

If the industry nature of the unit is filled in incorrectly, it will lead to errors in the industrial structure data obtained from the census, which will directly affect the quality of the census data on the composition of the relevant industries, leading to incorrect conclusions.

Therefore, the main business activities (or main products) are very critical and important indicators in the economic census.