To overcome the aggregation of nanocrystals in a blend of inorganic material with conjugated polymers to prepare photovoltaic material,we used a co-solvent blend of CHCl3 with MeOH at a certain volume fraction to disperse inorganic nanocrystals.The results show that when the volume fraction of MeOH is 50％,ZnO nanocrystals with an average diameter of 30 nm disperse well in the co-solvent solution.Its application in photovoltaic material was investigated in this work,and the photoluminescence(PL)spectra show that when ZnO was 50％(volume fraction)in solution and 25％(volume fraction)in film,the fluorescence quenching reached the maximum values 83.34％ and 64.4％,respectively,indicating that electron could transfer from conjugated polymer to electron-acceptor ZnO effectively.