The whole course of venture capital involves the interests relation of the organization of investment,venture capitalists and venture entrepreneurs ,which are three main market bodies,of which,venture entrepreneurs are the key personage who ensures the investment is value-added.The information asymmetry based on the relation about principal-agent and the moral hazard resulting from this have been the focuses to which the venture capital profession has paid close attention all the time.This paper explains the influence of venture entrepreneur's moral hazard with the reasoning method of the mathematics tools,and aims to construct a relevant model of encouragement and allocation of venture and provide a reference for the venture profession.