In China, Shenshuo electrified railway is one of the most important main artery that the western coal is transported to the east, where DC locomotives and AC locomotives are running at the same time. Thus, there are so abundant high and low frequency wide spectrum harmonics that have an adverse impact on power supply quality in this line. According to this situation, the equivalent circuit model of vehicle network was established, and harmonic characteristic on traction network was analyzed. A new type of injection hybrid compensation method was put forward, which was introduced from its compensation principle, harmonic current detection and control algorithm. The simulation results showed that this method could realize comprehensive treatment of the wide spectrum of harmonic, and obviously reduce active compensation capacity with high cost performance.