When the thylakoid membranes of blue-green algae broken over a longer time than usual by sonication were solubilized with low concentration of LDS and subjected to discontinuous SDS-PAGE improved at 4℃,15 containing chl bands for the first time was resolves. CPa1-CPa6 of them had similar absorption spectra. The fluorescence spectra of CPas at 77 K were very similar too,all having a emission peaks at 685 nm. It is concluded that 6 CPas were chl a-protein complexes of PSⅡ. The resolved capability to PSⅡ of the new system were 3 times of the popular ones.