In　order　to　study　the　GaInAs/GaAsP　multiple　quantum　well　solar　cells　(MQW-SC)　with　different　periods,　double-junction　solar　cell　samples　with　different　periods　quantum　well　(QW)　and　reference　sample　without　QW　were　grown　by　metalorganic　chemical　vapor　deposition　(MOCVD).　The　crystal　quality　of　the　samples　was　judged　by　high　resolution　X-ray　diffraction　(HXRD)　and　high　resolution　transmission　electron　microscopy　(TEM).　I-V　curves　and　external　quantum　efficiency　(EQE)　of　samples　were　measured　under　AM0　(1×)　spectra.　Relative　to　the　non-QW　sample,　the　absorption　spectra　of　QW　samples　extend　from　890　nm　to　954　nm,　the　highest　external　quantum　efficiency　of　the　extending　spectra　achieves　75.18%,　the　conversion　efficiency　increases　by　2.77%.　With　the　increased　periods　of　quantum　wells　structure,　the　response　of　the　extending　spectra　and　the　longer　wavelengths　(700-890　nm)　in　the　conventional　spectra　increase,　while　in　the　shorter　wavelengths　(300-700　nm)　the　response　has　a　fall.　Eventually,　the　short　circuit　current　and　the　efficiency　of　the　cells　are　improved　and　finally　tend　to　be　steady.　©　2016,　Science　Press.　All　right　reserved.