The　efficiency　of　the　organic　conjugated　polymer　solar　cells　can　be　significantly　improved　when　we　use　organic　conjugated　polymers　and　fullerene　blends　as　the　photoactive　layers　of　the　cells.　In　this　paper,　the　authors　demonstrate　the　preparation　and　characteristics　of　polymer-fullerene　solar　cells　based　on　ZnS　nanoparticles　(NPs)　of　composite　films.　With　blending　ZnS　NPs　in　the　polymer-fullerene　matrix,　it　was　found　that　efficiencies　of　the　solar　cells　with　0,　15,　30　and　45　wt%　ZnS　NPs　were　2.03,　2.18,　1.16　and　0.78　%,　respectively,　and　the　external　quantum　efficiency　(EQE)　of　the　solar　cells　was　maximum　while　the　concentration　of　the　ZnS　NPs　reached　15　wt%.　It　was　also　found　that　the　ZnS　NPs　can　increase　exciton　generation　and　electron　carrier　transport　under　some　experimental　condition,　and　will　improve　the　open　circuit　voltage　of　the　polymer-fullerene　solar　cells.