Abstract: For the food safety problem of the network ordering, by the analysis of the present situation of the network ordering industry in China, and the establishment of the optimization models, the paper analyzes the relationship and the influence factors between the platform scale of the initial construction period and the mature development period and the effort of the food safety supervision. The research shows that the network ordering platform could take more scale as the primary goal in the initial construction period, only in the scale is relatively small, can have the platform optimal effort level decision of the food safety supervision; the network ordering platform can determine optimal scale, and the smaller scale is, the higher optimal effort level of food safety supervision for the merchants is in the mature development period. Accordingly, the government departments should be based on the change of the relationship between the network ordering platform scale and its food safety supervision to make the deployment and the implementation of the corresponding food safety regulatory measures in development stage of different periods.

Key words: network ordering, platform scale, food safety supervision