In order to clarify the effects of paclobutrazol on the yield and physiological traits of different types of lushsoybeans, the application of 900 g/hm² paclobutrazol on the physiological and agronomic traits of different types oflush soybeans was analyzed by using two varieties with different plant types of lush soybeans as experimental materi-als at the early flowering stage. The results showed that paclobutrazol increased the chlorophyll content, photosyn-thetic rate, stomatal conductance, transpiration rate, stem diameter and branching number of soybean varieties withdifferent flourishing degrees. The plant height, middle internode length and leaf area index of soybean were de-creased, and the effects on yield of different types of soybean varieties were significant. With the control of pa-clobutrazol, LAI was reduced, the photosynthetic characteristics of the leaves were increased, and the light transmit-tability in the field was prevented. The grain weight per plant and the grain weight per hundred grains were signifi-cantly increased, thus the yield was significantly increased. However, the maximum LAI of the convergent cultivarswas close to the optimal LAI range, and the LAI was further decreased after the application of paclobutrazol. Al-though the leaf photosynthetic rate and 100-grain weight were increased, the grain weight per plant was significantlydecreased, but the yield was significantly decreased. The results indicated that the yield increase effect of using pa-clobutra was closely related to the canopy prosperity of soybean and should be applied under reasonable conditionsaccording to the characteristics of canopy development.