In the dense wavelength division multiplexing optical fiber communication system, the gain flatness of the Raman fiber amplifier is low and the bandwidth is narrow. Starting with the coupling equation of the front-end multi-pumped Raman amplifier, using the Runge Kutta method and the tellurium based fiber as the gain fiber of the multi-pumped Raman amplifier, the number of pumps, pump power and light in the multi wavelength pumping are analyzed by Matlab. Finally, the simulation of 100 nm transmission bandwidth is realized by using six pumps and setting pump power reasonably.