Abstract: A new method of identifying the load model parameters based on measured data from the phasor measurement unit（PMU）is proposed.The proposed method first selects appropriate data to identify the parameters based on the profile characteristics of voltage and circuit.Then according to the range of circuit magnitude variation obtained from the model,the initial rotor slip and the initial value of other parameters are obtained.To estimate parameter values,the least-squares fitting function of central axis based on active power and reactive power from model and PMU can be formulated.The proposed approach is illustrated with multiple cases in point from the North China Power Grid.The results show that the proposed method can provide acceptable estimates under small disturbance,without increasing computational time.