This paper analyses food safety problem in food supply chain of our country firstly, then points out food safety difference between food supply chain in our country and foreign countries. Compared with foreign countries, there are potential safety hazard in food production, food logistics and the whole supply chain in food supply chain of our country. On the basis of using foreign advanced food supply chain, this paper combines the reality of our country, attempts to adopt food safety purchase, food safety cold chain logistics, food safety trace back to ensure food safety in supply chain, and constructs food safety credit administrative system to promote enterprises to implement food safety ensuring measure. Food safety purchase, food safety cold chain logistics, food safety trace back and food safety credit administrative system compose food safety ensuring system of food supply chain