Abstract: Perovskite solar cells（ PSCs） have developed rapidly and received wide attention. As an important part,the back electrode has a significant influence on the photoelectric performance of PSCs. Seven different structures of back electrode were designed and simulated by COMSOL software to explore the effect of electrode structure and electrode thickness on the PSCs. In addition,the effect of back electrode thickness on photoelectric performance was also studied by experiments. It was found that the back electrode structure affects the performance of the cells by varying the series resistance,and the optimum thickness of the back electrode is about 100 nm by combining the simulation with the experiment.