Abstract: In order to meet the requirements of high temperature proton exchange membrane fuel cells，HPA/SPAEEKS composite proton exchange membranes were prepared by solvent casting film. FTIR spectra prove that the strong interaction between sulfonated acidic groups and HPA particles has been formed. The SEM pictures show that the solid HPA particles uniformly disperse in the composite membranes matrix. The thermo-stability of composite membrane is improved due to the introduction of HPA particle. The T_g and T_5%of HPA30/SPAEEKS-0.8 reach 236℃and 299℃respectively. The proton conductivity of HPA30/SPAEEKS-1. 0 composite membrane at 80℃ exceeds that of Nafion 117 under the same measured condition and reaches 0.098S/cm at 120℃.