Abstract: In order to explore the principle of reflection of solar wind ions on lunar magnetic anomaly area, based on the detection data of the solar wind ion detector carried by Chang’E2 satellite, we inverted the motion of the solar wind ions by using single particle simulation, and analyzed incidence angles and reflection angles. The experimental results show that the solar wind ions are firstly scattered by lunar regolith in all directions, then accelerated upward by lunar surface electric field. There is a positive potential of 45—75 V on dayside lunar surface in solar wind, which has a significant effect on the solar wind ions reflected
 from the lunar surface.

Key words: lunar magnetic anomaly area, lunar surface electric , field, scattered ion, single particle simulation