Due to the limited network nodes in the optical network link, the multiple wavelengths simultaneously inputted in network compete for the same output port and thus the communication network is made obstructed. Thus a Te-based Raman wavelength converter is applied to the 20×20 Mesh-Torus network when its placement rate is 50%, and its influence on the network blocking rate performance is analyzed. With the Bernoulli-Poisson-Pascal(BPP)network model, the effects of input wavelength number S and degree of conversion d of the Te-based wavelength converter on the blocking performances of the Mesh-Torus network are simulated and analyzed. The results show that when d is fixed, the variance of blocking rate is within 0.088-0.0945 for S=4 and within 0.0960-0.0995 for S=6, indicating that the increase of S slows down the blocking of network communication and the blocking rate increases slowly. In contrast, when S is fixed and with the increase of d, the blocking rate decreases approximately by 0.0005-0.004 on the original basis. Therefore, it is feasible to reduce the blocking rate of the Mesh-Torus network with a Te-based wavelength converter.