An attempt to remove Cs from radioactive effluent was made by chemical precipitation. Chemical precipitation using insitu precipitation with CuSO4 and K4Fe(CN)6 under optimized condition in the removal of Cs137 is in vogue. In the present work insitu precipitation of Cu3(PO4)2 using Na3PO4 and CuSO4 as precipitant and FeCl3 as flocculent was carried out. The optimized condition was found to be 189 ppm Copper with 477ppm CuSO4 190 ppm PO4 with 328 ppm Na3PO4 corresponding to 120% stoichiometry of the precipitation reaction, at pH 7.5 with 70 ppm ferric with 198 ppm ferric chloride as flocculent. The Copper phosphate powder of mesh size-20+40,-40+60,-60+80, -80+100 ASTM was used as column material for removal of cesium at different flow rate. The optimised size is found to be -80+100 ASTM and optimized flow rate as 15 bed vol/hr. The Cu3(PO4)2 powder was heated to different temperatures and so obtained powder was subjected to XRD study to analyze the crystallinity and SEM study to find the change in morphology. The heated and unheated Cu3(PO4)2 loaded with Cs was subjected to FTIR study to elucidate the type of bonding of Cs with Cu3(PO4)2 powder.