Abstract: The chemical corrosive wear mechanism of electroless Ni-P coating under unlubricated wear was studied by test and theory and the possibility of as an anti-chemical corrosive wear coating on drill pipe was probed into. The results showed that electroless Ni-P coating appear mainly delaminate wear and lightiy abrasive wear under unlubricated wear. At the condition of unlubricated wear, it is not suited to eletroless Ni-P alloy as a protective coating on drill pipe.