In order to integrate Web with crop growth models and decision-making support system, the field experiments of different basal levels were carried out in the experiment areas of Jiangsu Academy of Agricultural Sciences in 2005 adopting four cultivars such as “Wuyungeng 7”, “Yangdao 6”, “Yueyou 948” and “Nangeng 41”, which were mainly used in collecting cultivar parameters and updating database of them. The database of rice cultivars, soil and weather data were developed using SQL Server 2000. The pages of digital design of rice cultivation based on Web and simulation model (DDRCBWSM) were designed using Visual Studio .Net, which included register, the main page, cultivar parameter management, site data management, parameter adjustment, decision making for rice cultivation, and so on. The DDRCBWSM accorded with TCP/IP agreements, which could be installed and run in server (IIS5.0), and be browsed on Internet. It inherited mechanism, universal adaptability and utility of rice cultivation simulation-optimization-decision making system(RCSODS), combined Web techniques with research of rice growth models, set up web system of rice simulation-optimization-decision making, made agricultural technicians of main rice production area of China to gain pre-sowing optimization cases and rice management suggestions of the current year with dynamic, goal and digital characteristics in accordance with soil, cultivar and weather conditions online, and to fulfill technical direction through many kinds of manner such as paper, internet, email, television, wall newspaper, and so on, eventually.