The organic solar cells (OSCs) have become a very potential photoelectric conver ter with the characteristics of low production cost,flexible and simple process.The per formance of OSCs is closely associated with the properties of material and structure of device.The O SCs with structure of ITO/MoO₃/CuPc/C60/Re-Bphen/Al were fabricated with MoO_3as anode buffer lay er and Re-Bphen as cathode buffer layer.Under AM 1.5solar illumination,the optimal performance o f the OSCs was achieved with the thicknesses of MoO_3and Re-Bphen of 5nm and 8nm,respectiv ely.Power conversion efficiency (PCE) and lifetime are significantly improved.The working mechanism of the OSCs is also discussed in terms of the performance and device structure.