Law is the expression of the will of the ruling class, and is a tool or means to maintain the ruling class. How to make the best use of this tool is a problem that every country must solve. In today's intellectual circles, the definition of "science"and "technology"is numerous and diverse, but the discussion on the relationship between them and law is not enough. This paper tries to analyze the internal relation between "science","technology"and "law"from the Angle of sociology. This paper tries to discuss how to correctly understand and treat the relationship of the three.