Abstract: Technology of self-protecting paste Re-B-C-N multi-elements penetrating and application research of H13 steel hot extrusion dies treated were studied.The problems of the technology of powder Re-B-C-N multi-elements penetrating,such as casing and sealing,high consumption of reagent and the difficuties in the cleaning process,the influence on the organization and the hardness of the dies and so on,could be solved basically.