Abstract: In order to realize quasi lossless transmission of signal light on optical fiber link, by using high-order Raman amplification method of injecting the first order and the second order Raman pumping into both ends of fiber symmetrically, the numerical model of fiber optical quasi-lossless transmission system was built and the opmization of the system was carried out. The total power consumption and signal power variation with different pump power combinations of the first order and the second order Raman pump were investigated. The influence of signal power and fiber length on system performance index was studied. The results indicate that, system performance will be worse when signal power is higher than 1mW. And system flatness will be worse obviously when fiber length is longer than 60km. Quasi-lossless transmission can be realized along 60km fiber by utilizing this scheme and different pumping power combination schemes can be designed according to the actual demand of energy consumption and signal flatness.