The　absorption　spectral　properties,　fluorescence　spectral　properties　and　the　abilities　of　photo-generating　singlet　oxygen　of　four　phthalocyanines,　namely　tetra-a-(2,2,4-trimethyl-3-pentoxy)　phthalocyaninatopalladium　(zinc)　and　tetra-α-(2,4-diterbu-tylphenoxy)　phthalocyaninatopalladium　(zinc),　were　determined.　Experimental　results　show　that　the　ability　of　photo-generating　singlet　oxygen　of　phthalocyaninatopalladium　is　similar　to　that　of　phthalocyaninatozincx,　though　palladium　(II)　is　an　open　shell　electron　structure　and　zinc(II)　is　a　closed　shell　structure.　This　may　be　concerned　with　a　weak　fluorescence　intensity　and　a　strong　inter-crossing　transition　of　phthalocyaninatopalladium.