1. according to the changes of laws and regulations, expand the source of the case. With the development of socialist market economy, there are more and more laws and regulations concerning industrial and commercial administration, and the legislature often sorts out and integrates them. At this time, following closely the changes of laws and regulations and grasping the key points of adjustment of laws and regulations can effectively find the source of the case.

2. according to the seasonal changes, find the source of the case. With the change of four seasons, illegal activities will show different characteristics. For this kind of illegal behavior, law enforcement personnel should focus on the seasonal characteristics and find the source of the case. For example, during the spring ploughing period, agricultural materials cases that frequently produce and sell fake pesticides, fake fertilizers and fake seeds need to be focused on by law enforcement personnel.

3. according to the development of standards, delineate the source of the case. China's current product quality standards include national standards, local standards, industry standards and enterprise standards. With the improvement of technical level, product standards are constantly upgraded. When carrying out commodity quality monitoring and inspection, law enforcement officers should delineate the possible scope of illegal acts according to the development and changes of relevant standards.

4. Dig the source of the case according to the existing cases. In practice, some illegal acts are often inextricably linked. For example, manufacturing and selling fake and shoddy goods, trademark infringement, illegal advertising, commercial bribery, restriction of competition, false capital contribution and other illegal acts generally do not exist in isolation, and usually need the cooperation of others to complete. This requires law enforcement officers to have the ability to find other related sources through one case. For example, if law enforcement officers find that a hotel sells beer with trademark infringement, they should continue to understand the source of the infringing beer and other related issues.

5. according to the economic development, find the source of the case. In recent years, there have been many new and concealed illegal acts, which have brought difficulties to administrative law enforcement. Through analysis, we can find that these illegal acts are generally accompanied by the rapid development of a certain industry or the sharp rise in the prices of certain commodities. For example, with the rising price of edible oil, there have been many illegal acts, and there have even been cases in which refined waste oil is sold as edible oil.