At present the problem of environmental impact on construction project has already became an international issue. To reduce the bad effect of environment caused by the project we should start from the initial research stage. In order to improve the scientific reliability of the project's environmental efficiency, a new concept for the feasibility of the environmental efficiency of the project is proposed in this paper-"Feasibility Study Concept of Lean" based on the core concept of Lean Construction Thinking. This paper also analysis the connotative and implicational principles of the construction project's environmental efficiency "Feasibility Study Concept of Lean".