in the actual work of national economic accounting, the service industry is generally regarded as the tertiary industry. In the industry classification of national economy, there are all other fifteen industrial sectors except agriculture, industry and construction (the industry classification of national economy is subdivided into 1, agriculture, 2, mining, 3, manufacturing, 4, production and supply of electricity, fuel and water, and 5, construction and other five physical commodity production sectors). That is,

1. Transportation, warehousing and postal services.

2. Information transmission, computer services and software industries.

3. Wholesale and retail industries.

4. Accommodation and catering

5. Finance

6. Real estate

7. Leasing and business services

8. Facilities management industry

11, residents service and other service industries

11, education

12, health, social security and social welfare industry

13, culture, sports and entertainment industry

14, public management and social organizations

15, international organizations.

the basic difference between the service industry and other industrial sectors is that the service industry produces service products, which have the characteristics of immateriality, non-storability and the simultaneity of production and consumption.

There are differences between service industry and tertiary industry in daily application. Generally speaking, when describing the industrial sectors of the national economy through specific industrial sectors of the national economy, such as agriculture, industry and construction, "service industry" is adopted; The "tertiary industry" is used to describe the industrial sectors of the national economy through the development levels of the national economy, such as the primary industry (hereinafter referred to as the primary industry) and the secondary industry.

It should be noted that:

1. Service industry can be divided into service industry and service enterprise. The production departments and enterprises that provide service products for value-added purposes are collectively called service industries; In order to meet the needs of the public, the government acts of providing service products are called service undertakings.

2. Tourism is not a relatively independent service sector in a strict sense. Except for travel agency activities, which belong to the service category under leasing and business services, other activities, such as tourism facilities construction, tourism catering, tourism accommodation, tourism shopping, tourism culture and tourism product development, belong to other industrial sectors. This is obviously different from the popular concept.