China's evaluation of "National Standardization Good Behavior Enterprise" is divided into four grades: 4A, 3A, 2A and1a. Standardized good behavior enterprise refers to the establishment and improvement of enterprise standard system with technical standards as the main body, including management standards and work standards, and its effective operation. Standardized management has been implemented in all aspects of production and operation, and good economic and social benefits have been achieved. Obtaining the "4A" certificate means that the product quality, management level and reputation of the enterprise are internationally recognized.