Abstract: The powder polyethglene plastics has good properties on corrosion resistance,resistance to wear and pound.This research takes the powder coating technology of fluidized-bed to make the segregating gratings used in highways.Covered with a layer of well-distributed and compact polyethglene,the life-span of the products can be greatly improved.The purpose of experience is to get the best technological parameters about the temperature of preheat and plasticity,time of pause and plasticity,and effect on properties,which provides a designing basis for dipping plastic coat automatic production 1ine of segregating gratings used in highways.