The shortcomings in the current land expropriation in our country make the land expropriation work difficult to carry out,in order to solve this problem,local governments do a series of explorations in the practice of land expropriation.In this process,some areas gradually find a method that called replacement,which changes the disadvantages in the current land expropriation.In this paper the author introduces the features of double replacement and its effects on land expropriation reform,and proposes the direction of land expropriation reform.