Optimizing solar cell structure is an effective way to improve the light capturi ng ability,even photoelectric conversion efficiency.A rectangle hollow waveguide solar cell was fabricated based on trad itional planner solar cell.The influence of waveguide structure on light injection,light capturing ability and photoelectric conversion efficiency has been theoretically and experimentally investigated.The light capt uring ability of hollow waveguide solar cell was theoretically predicted based on multi-layer reflecting theory and wav eguide reflective model.The incident light can be confined inside the waveguide,reflected and absorbed for multiple times.Results show that the light capturing ability of hollow waveguide structure can be higher than tha t of planner structure.The light capturing abilities and photoelectric conversion efficiencies of the planner solar cell an d the hollow waveguide solar cell were measured with parallel incident beams at different angles.The waveguide solar c ell almost could capture all the incident light and increase the photoelectric conversion efficiency for 3-5tim es,compared with the planner structure solar cell.The light capturing abilities of single junction rectangle hollow wa veguide solar cell with different cross-section areas and waveguide lengths were calculated.A method to optimize the rectangle hollow waveguide structure on the perspective of layer structure and hollow core radius is propos ed.By structural optimization,a better light capturing efficiency may be achieved with smaller hollow waveguide structured single junction solar cell.