Abstract: The satellite orthogonal frequency division multiplexing (SOFDM) system is usually considered as an enormous amount of sub-carriers and large-scaled system architecture,as well as complicated channel transmitting characteristics,which makes some traditional dynamic channel resource allocation methods inefficient and induces to much power loss,such as the fixed group classification means. An improved method was proposed,which was designed to allot frequency and power resources via the genetic arithmetic with the survival of the fittest principle. The experimental results demonstrate that it can assign the sub-carriers and power in a more reasonably manner. Although its computational complex is equivalent in comparison with the genetic method,this novel means is able to save the system power almost 1dB,so as to remarkably spare the system resources and also improve the system package error rate (PER) performance.