Abstract: This paper discusses the necessity and signif i cance of demonstrating feasibility of major project upon climate, analyzes the progresses and current problems; suggests some ideas and measures to solve these problems in technology, business and service for major projects in China; points out the key technologies, which include the project feasibility on the future extreme weather and climate events, the numerical simulation of the interaction between the major projects and surrounding environment, the comprehensive detection of multi-source and three-dimensional climate information, the dynamic assessment of disaster inf l uence process and risk, the improvement of regional representative and real-time update of meteorological parameters. It offers future references for demonstrating feasibility of major projects upon climate in China.