1. Industry

1. Medium-sized enterprises must have at least 311 employees, sales of 31 million yuan and above, and total assets of 41 million yuan and above;

2. The rest are small enterprises.

2. Construction industry

1. Medium-sized enterprises must have 611 employees and above, sales of 31 million yuan and above, and total assets of 41 million yuan and above;

2. The rest are small enterprises.

III. Wholesale and Retail Industry

1. Medium-sized enterprises in retail industry must meet the requirements of employees of 111 and above at the same time, with sales of RMB 11 million and above;

2. The rest are small enterprises.

IV. Transportation industry

1. Medium-sized enterprises in transportation industry must have 511 employees and above at the same time, with sales of 31 million yuan and above;

2. The rest are small enterprises.

V. Accommodation and catering industry

1. Medium-sized enterprises must meet the requirements of 411 employees and above at the same time, with sales of 31 million yuan and above;

2. The rest are small enterprises.

Extended information:

Small and medium-sized enterprises are enterprises with large production scale compared with small and medium-sized enterprises, that is, enterprises with high concentration of labor, labor means, labor objects and products. Large-scale enterprises play an important role in the national economy and are the focus of national construction. They meet the objective requirements of production socialization and scientific and technological progress and can bring obvious economic benefits in investment and production and operation. We should treat the establishment of large enterprises correctly according to the specific characteristics and conditions of different periods, so as to give full play to the advantages of large enterprises on the basis of the combination of large, medium and small enterprises.

generally speaking, an enterprise refers to a legal person or other social and economic organization that uses various factors of production (land, labor, capital, technology and entrepreneurial talent) to provide goods or services to the market, and operates independently, assumes sole responsibility for its own profits and losses, and conducts independent accounting.

in the category of commodity economy, as one of the various modes of organizational units, an organic economic entity, according to certain organizational rules, generally aims at making profits, with the mission of maximizing the interests of investors, customers, employees and the public, and exchanges income by providing products or services. It is the product of social development, and it has grown stronger with the development of social division of labor. Enterprises are the main participants in market economy activities; Under the socialist economic system, the coexistence of various enterprises constitutes the micro-foundation of the socialist market economy. There are three basic organizational forms in enterprises: sole proprietorship, partnership and company, and the company-based enterprise is the most important and typical organizational form in modern enterprises.

according to modern economic theory, enterprises are essentially "a mechanism of resource allocation", which can realize the optimal allocation of social and economic resources and reduce the "transaction cost" of the whole society.

Resources: Baidu Encyclopedia-Small and Medium-sized Enterprises