Abstract: The photosynthetic potential productivity, light-temperature potential productivity and climatic potential productivity in Sichuan Basin were calculated, then some stations were selected to analyze variation character of main meteorologic factors and the impact of which on crop potential productivity.The results showed that sunshine duration and precipitation were decreasing which made potential productivity decrease, and temperature was rising which made potential productivity rise.In 1970s, every type of potential productivity was higher relativity, and light-temperature potential productivity got another higher value in 2006.While in recent ten years, every type of potential productivity was less than that in 1970s, light-temperature potential productivity will increase 6% as the temperature rises 1℃, and climatic potential productivity will decrease 1.6% as precipitation decrease 10%.The difference between potential productivity and real productivity was analyzed, then two keys to improve real productivity to suit climate variation were advised, one was to quicken to construct large-middle type of irrigation projects and develop water saving irrigation, another was to use the rise of temperature.