Guaranteeing peasants’ life level model of land expropriation based on the guaranteeing the present life level of the peasants whose land is expropriated makes obvious achievements in the process of rapid urbanization but brings corresponding social contradictions and problems because of interests distribution contradiction and further results in mass disturbance. Guaranteeing style land expropriation model has institutional contradiction in the perspective of Land Management Law, Constitution Law and Real Rights Law, has the policy paradox between land expropriation effect and urbanization goal, in operation mechanism, only has simple dialogue between government (development merchants) and the peasants from up to down, and has the shortage of restriction and management with administrative enforcement of land expropriation. With the promotion of new-style urbanization and productivity level, the government has the economic ability to compensate the peasants whose land is expropriated, and the land expropriation model should upgrade and transform in protection style by the goal of protecting long-term interests of the peasants under the guidance of social justice theory of Marxism. The construction of protection style land expropriation model should crucially embody the justice of interests distribution and the fairness of dialogue mechanism, need to revise compensation policy for land expropriation, build multiple social compensation policies, set up and perfect democratic decision-making mechanism of notice-feedback-notice and fair negotiation mechanism by the cooperation among peasants-government-development merchants.