The　graft　copolymerization　of　acrylamide　(AM)　onto　corn　starch　initiated　by　potassium　persulfate　(KPS)　was　studied.　The　effect　of　the　concentration　of　acrylamide　and　potassium　persulfate,　temperature,　and　polymerization　time　on　graft　percentage　and　grafting　efficiency　were　high　when　[AM]　=　1.2　mol/L,　[KPS]　=　4-5　mmol/L,　and　the　reaction　is　carried　out　at　∼　60°C　for　4　hr.