Abstract: Aiming at the problems that the load identification and location under the same type, the same parameters and the same working conditions are difficult to be realized by the existing non-intrusive load monitoring methods, we propose a new active sensing method of power system load network based on power line carrier impedance. Firstly, the concept of load network is introduced into the household appliance load cluster after the residential energy meter, and the power line transmitting electric energy is regarded as a part of the load cluster to form the user side load network framework. Secondly, based on the difference between load impedance and input impedance under the high frequency transmission line model of power line carrier, the spectrum characteristics of input impedance are obtained by transmitting carrier signal, so as to realize the identification and location of the same load. Finally, the effectiveness of the proposed method is verified by several groups of related experiments, and the fitting and filling of load network matrix parameters based on XGboost algorithm are realized. The identification signal is changed from passive "load signature" to active "impedance sensing", which solves the problems of the same load identification and location that are difficult to deal with by traditional methods.