We increase the number of routes to design a routing switch.So a THz three-channel routing switch base d on two-dimensional magnetic photonic crystal is proposed.In this scheme,the property that magnetic permeab ility of the ferrite material changes with external magnetic field and the coupling characteristics between the line d efects and the ferrite material point defects are used.The transmittance of each channel can be increased by designin g a suitable structure.Numerical simulation is presented by plane wave method (PWM) and finite-dif ference time-domain (FDTD). The results show that the extinction ratio of channel 1is 12.74dB,and those of channel 2and channel 3are both 28.05dB.The response speeds of the three-channel routing switch can r each 18.52ps,121.11ps and 121.11ps respectively.The proposed THz wave routing switch will have important application in integrated optical circuit.