Carbon fibers (CFs) coated with polyethylene polyamine were treated at 600℃ for 30s in the furnace, then washed using water and dried. The surface function groups, surface roughness and the wetting properties of CFs before and after aminating treatment were investigated respectively by FT-IR, atomic force microscopy (AFM) and contact angle measurement. It was found that the amino groups (CO-NH₂) were introduced to the surface of the amination treated CFs and slight heaves on the surface were also decreased. The contact angles of CFs with epoxy resin and water were decreased by 22% and 32% respectively. The interlaminar shear strength (ILSS) of CF-reinforced resin composites (CFRP) which employed treated CFs and untreated ones were both evaluated by three-point-bending approach. Heat treatment makes the ILSS of CFRP increase by 6.65%, while aminating treatment makes the ILSS of CFRP increase by 24%. The results of mechanical analysis showed that the aminating treatment has little effect on the strength of CFs.