Abstract: The construction of social stability risk evaluation mechanism, which apply to major land consolidation projects，is of a great practical significance on standardizing management of major land consolidation projects and other relevant affairs. Based on the whole lifecycle management requirements of major land consolidation projects, this paper systematically analyzed the connotation of social stability risk of major projects, and put forward the corresponding risk evaluation process. Moreover, we established the risk evaluation system by using the PSR model. The study indicated that: 1) The social stability risk of major land consolidation projects exist in different forms at various stages including the project demonstration, implementation and management. In term of that, risk evaluation should make a comprehensive analysis of risk factors that may exist in the whole process of land consolidation according to key tasks and characteristics of major projects at each management stage.2) The risk evaluation process should include risk survey, risk identification, risk evaluation and risk elimination.3)The risk evaluation system based on PSR model can reflect the whole affect process of the social stability risk from it’ s emergence, conduction, function and control, which provided a logical framework for the selection of risk evaluation indicators of major land consolidation projects.