Abstract: Aiming at the problem that the harmonic source model is too simplified to accurately characterize the harmonic source characteristics,a data-driven general harmonic source model based on partial least squares regression is proposed in this paper. Firstly,the real part and virtual part of the vector data of harmonic voltage and harmonic current detected at common connection points are solved. Secondly,based on the linear relationship in the equivalent model,the harmonic impedance of the system side is solved. Thirdly,the harmonic emission level of the harmonic source is solved by the approximate method. Finally,the harmonic source model is established using the equivalent two-port network of constant current source and parallel variable harmonic impedance. The feasibility of the proposed method is verified by a simulation example.