Ab　initio　calculations　on　some　metal　phthalocyanines　MPc(　M=Zn2+,　Cu2+,　Ni2+,　Co2+,　Fe2+,　Mn2+)　have　been　carried　out.　The　total　energies,　spin　multiplicities,　charge　distribution,　bond　orders,　the　front　molecular　orbital　compositions　and　orbital　energies　have　been　obtained.　The　results　about　spin　multiplicities　are　in　agreement　with　the　experimental　value.　The　differences　in　photosensitivity　between　MPcs　can　be　explained　by　the　different　contribution　of　d　orbital　of　central　ions　to　HOMO　or　LUMO.