The　geometries　of　eight　unsymmetrical　squaraine　dyes　have　been　optimized　by　ab　initio　method　at　the　6　-　31G　(d,　p)　basis　set.　The　quantitative　relationships　between　their　intramolecular　charge　-　transfer　degrees　and　their　dark　decay　values,　their　photosensitivity,　and　the　largest　wavelengths　of　their　absorption　spectra　have　been　studied.　The　results　indicate　that　their　intramolecular　charge　-　transfer　characteristics　is　an　important　factor　which　affects　their　photoconductivity　and　the　largest　wavelengths　of　their　absorption　spectra.