The primary industry refers to agriculture, forestry, animal husbandry and fishery.

The secondary industry refers to mining, manufacturing, production and supply of electricity, gas and water, and construction.

The tertiary industry refers to other industries except the primary and secondary industries.

The tertiary industry includes transportation, warehousing and postal services, information transmission, computer services and software, wholesale and retail, accommodation and catering, finance, real estate, leasing and business services, scientific research, technical services and geological exploration, water conservancy, environment and public facilities management, residential services and other services, education, health, social security and social welfare, culture, sports and entertainment, public management and welfare.

Because industry and commerce do not belong to the primary industry, nor to the secondary industry, but to the tertiary industry.

The relationship between the three major industries-interdependence and mutual restriction;

① The primary industry lays the foundation for the secondary and tertiary industries;

② The secondary industry is the core of the three major industries and plays a leading role in the primary industry;

The primary and secondary industries create conditions for the tertiary industry, and the development of the tertiary industry promotes the progress of the primary and secondary industries.

According to the Opinions of the National Bureau of Statistics on Establishing a Statistical Report on the Tertiary Industry of China's Three Industrial Divisions forwarded by the General Office of the State Council, China's tertiary industry includes two major departments: circulation and service industry, which are divided into four levels:

First, the circulation department: transportation, post and telecommunications, commercial catering, material supply and marketing and warehousing;

Second, departments that serve production and life: finance, insurance, geological survey, real estate management, public utilities, residents' services, tourism, information consulting services and various technical services;

The third is the departments that serve to improve the scientific and cultural level and the quality of residents: education, culture, radio, television, scientific research, health, sports and social welfare;

Fourth, state organs, political party organs, social organizations, police, military, etc. , but they are not included in the tertiary industry output value and gross national product of China. It can be seen that this tertiary industry is basically a service industry.

Extended data:

In order to standardize the caliber and scope of the three industries and service industries and promote the development of China's service industry, the "05 agriculture, forestry, animal husbandry and fishery service industry" in Class A, "1 1 mining auxiliary activities" in Class B and "manufacturing industry" in Class C were classified.

After adjustment, the primary industry is divided into four categories; The secondary industry consists of 2 categories and 36 categories; The tertiary industry consists of 15 and 3 categories.

The tertiary industry classification is an industrial classification method first established by New Zealand economist Fisher. He put forward the method of industry division in the conflict between security and progress written by 1935. ?

On the basis of Fisher, British economist and statistician Clark made a lot of empirical analysis on the relationship between the three industrial structure changes and economic development by using three industrial classifications, and summarized the laws of the three industrial structure changes and their influence on economic development.

According to the "three-industry classification", the department in the national economy that mainly uses natural forces to produce products or industrial raw materials that can be consumed without deep processing is called the primary industry.

References:

Baidu Encyclopedia-Provisions on the Division of Three Industries