Abstract: Two different low density polyethylene（LDPE）resins produced by tublar process（2420M）and kettle-type process（1C7A）were studied and compared in properties，molecular weight，molecular distubtion and crystallization.It was found the lower long chain branch degree is the main reason causing poor performances of tubular LDPE.The kettle-type LDPE has a wide molecular distubtion，more content of long branch chain and less neck-in，it is superior to tubular LDPE for extrution coating.