Abstract: Firstly,some post evaluation theoretical foundation for mining investment project was introduced;secondly,a post evaluation model for mining investment project was built based on fuzzy comprehensive evaluation theory;finally,a W-Sn deposit was taken as an example for further applications,and also the project implementation effect was analyzed.Above research showed:to give post evaluation for the completed investment projects and then draw useful experience and lessons can help to improve the benefits of the project and direct the future projects,which can improve the decision and management levels of the mining investment.