Abstract: An algorithm to jointly optimize the power allocation and the slot allocation in order to improve the utilization efficiency of the limited resources on the satellite was proposed. The basic principles of the mutual compensation and mutual independence between these two resources are explored to pave the way for joint optimization. Considering the differences about each station’s channel condition and capacity requirement, a state-combination model for optimally allocating the resources is setted up, so as to adapt the multi-resource usage pattern with each earth station. Targeting at the energy efficiency, an iterative dual optimization algorithm is proposed, and the final optimal policy for resource allocation with low complexity is obtained. With the simulation and analysis, the proposed joint optimization is verified to perform better than the non-joint ones in the perspective of the energy efficiency, especially when the frequency resource (the carrier number) is less.