This paper uses probit model to analyze the factors affecting farmers' expropriation will,result indicate :land type,compensating limit and investment in land arose expropriation will to change negatively；land area,benefit from expropriation and right of expropriation arose expropriation will change positively.conclusion can be drawn: we should protect farmers' benefit by concerning farmers' negotiating position,exercising the right of expropriation correctly,allocating expropriation scope,settling off-farm employment.