The food safety law in China has gone through a long period of development，and each stage of the development plan meets the requirements of the times. This paper reviews the historical evolution of the food safety law in China，which is divided into preparation stage，development stage and mature stage. Then，the paper analyzes the change reasons of the food safety law in China from three aspects. Firstly，supervision object changes are the main reasons for the policy changes. Secondly，the dynamic game between different stakeholders is the fundamental reason of policy changes. Thirdly，realizing the goal is the direct cause of policy changes. Finally，the paper reveals the development trend of new “food safety law” in China through the establishment of risk assessment and early warning emergency system，strengthening the supervision system and the establishment of strict legal liability system.