The effect of chemical fertilizer,combined application of chemical fertilizer and different biochar application rates on soil physical properties,soybean morphological indexes and yields were studied.The results showed that in compared with T1(chemical fertilizer),for the other three treatments bulk density was decreased by 3.1%~10.2%,length of stem and root,stem weight and soybean yield were all increased.The percentage of the yield increased for T2,T3 and T4 were from 4.8% to 12.1% and meanwhile Dickson Quality Index showed the similar trend with values from 7.79 to 9.71.Soybean yield was positively correlated with biochar application rates or Dickson Quality Index.The relationship between yield and Dickson Quality Index could be expressed by quadratic equation with determination coefficient of 098.The results illustrated that the combination of biochar with chemical fertilizer could characterize soybean growth in a certain degree,which could provide the theoretical basis for soybean yield and environment adaptability of morphological development under various fertilizer application management.