The bottom clause of the crime of illegal business operation is to discuss the unavoidable problems of strictly observing the humble bottom line of criminal law in the economic field and creating a good business environment. It is the basic requirement of continuously optimizing the legal environment of market-oriented and legalized international business to keep the bottom clauses of the crime of illegal business operation. However，with the gradual establishment of a unified domestic market with fair competition and the need to release enough legal space for market development，the caliber of the crime of illegal business operation as a “pocket crime” will gradually shrink. In order to ensure the final legal protection of the market access system，it is necessary to set the crime and punishment norms of illegal business operation which are both normative and clear and adaptable in the future. The bottom clause of the crime of illegal business operation is to discuss the unavoidable problems of strictly observing the humble bottom line of criminal law in the economic field and creating a good business environment. It is the basic requirement of continuously optimizing the legal environment of market-oriented and legalized international business to keep the bottom clauses of the crime of illegal business operation. However，with the gradual establishment of a unified domestic market with fair competition and the need to release enough legal space for market development，the caliber of the crime of illegal business operation as a “pocket crime” will gradually shrink. In order to ensure the final legal protection of the market access system，it is necessary to set the crime and punishment norms of illegal business operation which are both normative and clear and adaptable in the future.