Abstract: The effect of accumulative temperature, sunshining duration, rainfall and diurnal average temperature on the yield of vegetable soybean were analysed with the experiments in different sowing periods in 1994.The results showed that the yield and main economic characters of veg-etable soybean were largely influenced by meteological factors during the growth stages, especially early stages(from seedling emergence to first flowering)were mainly effected by accumulative temperature.The dominant factor affecting the yield was different in various growth stages,i.e.the duration of sunshining in pod-setting stage, rainfall in pod-filling stage and average diurnal temperature in maturing stage.The yield arrived the highest level when there were more than 90 hrs of sunshining duration in pod-setting stage, 91 mm rainfall in pod-filling stage and 27℃ of di-urnal average temperature in maturing stage.