Abstract: In the lunar surface environment,the lunar dust which settle on the solar cells will change the output para-ments,thus reducing the on-orbit output efficiency and service life of solar cells.In this paper,a model is built through the-oretical analysis,the relationship between solar cell output parameters and solar light incident angle is calculated,and a platform which is used to investigate the output characteristics of solar cells is built to measure the short-circuit current,open-circuit voltage and transfer efficiency of solar cells and to plot the related curves,the curves' trend is consistent with the model prediction results.The conclusions of this paper can be used for the calibration of on-orbit solar cells in the future,and calculating reversely the data related to the lunar dust.