With the continuous development of three-phase power supply equipment, in which the electromagnetic interference problem is also gradually prominent, however, the traditional three-phase hybrid emi filters are still facing the problem of poor stability and high cost, in order to solve the problem this paper in the traditional hybrid emi filters based on the use of a new type of integrated active circuit chip TPSFxxxx, which is capable of generating 30 dB of attenuation from 150 kHz to 5 MHz, while this paper investigates the different combinations of passive and active filtering parts. At the same time, this paper investigates different combinations of passive and active filtering parts, and concludes that under ideal conditions, the active filtering effect is best when common mode inductors are added on both sides, then this paper also investigates the effects of different inductor positions and inductance values on the stability of the system, and finally designs relevant experiments for verification.