Proportion of load consumption component is chosen as a characteristic of each load using for load classification and model identification in this paper.The crucial buses with high-voltage which fully participate in the system dominant oscillation mode are chosen as the observed objects in regional load model identification.The objective function of load model identification is established using the voltage of the observed objects.Gradient optimization algorithm is used for optimal value searching.Simulation results verifies the proposed method,and three load classification strategies including miscategorized method,classification according to the electrical distance between two loads and classification according to the proportion of load consumption component are compared with simulation tests.The results show that the load identification value based on classification according to the proportion of load consumption component is more accurate and applicable to other occasions.