Abstract: Based on 14 years data of growth and development of summer soybean and agro-meteorological observation from Suzhou station,the impact of reproductive stages and the key meteorological factors on summer soybean growth was analyzed using SAS software. The results showed that summer soybean flowering to filling was the most sensitive stage to changes of meteorological factors,and the fitting model was at the very significant level,and that the average diurnal temperature range,rainfall and rainfall days were main factors in the stage. Other stages were not sensitive to climatic factors.

Key words: Summer soybean, Summer soybean, Growth curve, Impact factor, Huaibei region