The emerging issues of agricultural products security risk had given rise to continue public dissatisfaction，and tortured government functions in agricultural products security risk administration. In order to better clarify the logic of government behavior in food safety risk management，combined with government regulation and related theories，this article took government functions regulation and their behavior borders as the starting point，and conducted a random sample survey of 986 farmers in 5 typical agricultural provinces from the perspective of pesticide application. Based on the empirical survey data，this paper analyzed the core functions that government should have in agricultural products security risk administration from the aspects of pesticide application criteria loss caused by the lack of system deficiencies，non-standard behavior of pesticide application caused by the lack of public services，misbehavior of pesticide application caused by supervision failures，vicious cycle of pesticide rewards caused by the lack of rewards and punishment mechanism. Combined with realistic scenarios，functions range between government and society as well as between governments and markets were defined.