Abstract: In order to prolong the life of solid oxide fuel cell（SOFC）and improve the system performance,this paper takes the 5 kW planar SOFC system as the research object,under the condition of meeting the power requirements and temperature constraints,explores the optimal combination of operating parameters to achieve the highest system efficiency. In this paper,the modular modeling method is used to build the simulation model of SOFC independent power generation system based on the working mechanism. Secondly,based on the established system model,the SOFC system efficiency optimization problem is formed by defining four operating parameters and combining the thermoelectric constraints of the system. To solve this problem,a two-level optimization scheme combined with meta-heuristic optimization algorithm is proposed for the first time,that is,the operation parameters are divided into two levels according to their impact on SOFC system,the first level of operation parameters are discretized,and the second level of operation parameters are optimized by sparrow search algorithm. The results show that the global optimal operating point can be obtained by the proposed optimization scheme,and the SOFC system can meet the power requirements and temperature constraints and achieve the optimal system efficiency.