Abstract: Study the application of backtracking technology in horizontal single-axis trackers. Analyze the advantages of backtracking technology for the improvement of power generation of photovoltaic system,and the advantages of saving land area. Combined with the simulation model,the advantages of the power generation improvement and the land-area saving of the backtracking technology in the horizontal single-axis tracking system are verified. The results showed that without increasing the land area,the application of backtracking technology can avoid shadow occlusion inside the photovoltaic array,reduce power generation loss,and make the horizontal single-axis tracking system more efficiency and generate more power per unit area.