Organic solar cells with stacked bulk heterojunction(BHJ) are investigated based on conjugated polymer.By using the solution spin-coating method,Poly [2-methoxy,5-(2' -ethyl-hexyloxy) -1,4-phenylene vinylene](MEH-PPV) and ZnO nanoparticles(50 nm) are mixed as the optical sense layer.Ag is used as inter-layer to connect the upper BHJ cell and the lower cell.The structures are ITO/PEDOT:PSS/MEH-PPV /Ag / MEH-PPV:ZnO /Al.The open circuit voltage(VOC) of a stacked cell is about 3.7 times of that of an individual organic solar cell(ITO/PEDOT:PSS/MEH-PPV /Al).The short circuit current(JSC) of a stacked cell is increased by about 1.6 times of that of individual one.