For enhancing the wear-resistance of plain carbon steel and stainless steel, surface molybdenizing was performed on the steel using double glow plasma process. The element distribution and organization of molybdenized layer were investigated. Its micro-hardness and ultra-micro dynamic mechanical properties were tested. Its friction and wear properties from room temperature to 600℃ were tested on a pin-on-disk tribomoter. The result shows that the thickness of alloy layer was approximately 30 μm in thickness by surface plasma molybdenizing at 950℃. The hardness decreases gradually from HV_0.1450 of top layer to HV_0.1235 of the matrix which was in accordance with the contents of molybdenum alloy elements. Pin-on-disk wear test indicates that the friction coefficient of alloyed layer at the temperature range of room temperature to 600℃ decreases from 0.5～0.6 to 0.2～0.3 and wear rate decreases by 20% at elevated temperature after molydenizing.