The high harmonic current which is produced by the AC-DC and AC-DC-AC locomotives of high-speed railway may cause traction network resonance and harmonic current amplification. Aiming at the traction network resonance and harmonic current amplification in high speed railway system, the amplified multiple of harmonic current is derived. The mathematical derivation for harmonic model of traction power supply system considering high-pass filter is derived firstly. Based on this model the parameter and location for the wave-trip high-pass filter in the traction network is optimized with the optimization objective of ten percent of the total harmonic distortion. An effective method to select parameters of wave-trip high-pass filter is proposed. The results show that when the resistance of wave-trip high-pass filter is small, the requirement for the capacity of filter is higher. This work is supported by the Technology Research and Development of China Railway Corporation (No.2014J009) and the Fundamental Research Funds for the Central Universities (No. 2682014RC07).