Abstract: SiB2, forced by five meteorological variables, was adopted to model the energy budget and CO₂ flux during stem extension, tassel and mature period over rice field in Changshu country of Jiangsu Province, China. These meteorological variables are solar radiation, vapor pressure, air temperature, horizontal wind speed and precipitation from in situ observation. Result shows that the energy partitions over these periods are different, so do CO₂ fluxes. The related results are close to those of IREX96. The SiB2 was demonstrated with automatic weather station (AMS) data and cold be used to estimate the energy components, CO₂ flux, soil wetness and soil temperature profile.