In this study, a new soybean dwarf strain named F03 was improved, which was derived from the cross between fascinated soybean of China and fascinated soybean of American. In order to analyze the contribution of GA₃ on the dwarfing of F03, F03 in different growth stages were treated with 40 mg/L exogenous GA₃. The results indicated that the plant height, internode length of major stem, short pod-branch number and terminal inflorescence length increased significantly after treatment, however, stem diameter and node number of main stem were not significantly influenced by exogenous GA₃ treatment.