Abstract: The present paper describes the research results concerning the pasty boronizing of iron base P/M parts. The mirostructure and composition of boronizing layer were observed and analysized with scanning electronic microscope, electronic probe and optical microscope respectively.The basical factors influencing the thickness of boronizing layer were studied, meanwhile the hardness and wear-resistance of the layer were determined.The experimental results show that the pasty boronizing of iron base P/M parts is an useful technology of chemical heat treatment.