Abstract: In this paper, the quantitative relationship between soybean development of different varietal types and main environmental factors (temperature, photoperiod, act.) was systematically studied. The soybean development simulation model(SDSM) was constructed based on the thoughts of the wheat development simulation model(SDSM) expressed by a multiple form of exponential functions and the Rice Clock Model and the DSSAT3 Model .Appling the SDSM , average error of different soybean varieties was in 1~3 days, The precision of the SDSM is higher than traditional accumulate temperature method.