Abstract: Based on the staged sowing experiments of the late－autumn crops，we already set up an integrated indices of eco－climatic adaptability used in Chongqing area，and also develop a web－based agrometeorological service software system which adopts the limit transformation method and the weighed analogical analysis techniques．According to the different demands of the effective accumulated temperature，the suitable sowing temperature，and the ending temperature of grain filling，the system will take use of the short－term climate prediction data，and can provide the different suitable sowing periods or planting schemes for different late－ autumn crops．Furthermore，the system has been adopted by all districts of Chongqing province，and some districts of Sichuan province，such as Luzhou district and Guangan district．The application results show that，this system plays a great role to increase the production and quality of the late－ autumn crops，to improve the agrometeorological service level．It is a good exploration for developing the specialization and fine planting technologies based on farming weather forecast．