The　wear　mechanism　of　amorphous　Ni-Fe-P　coating　was　discussed.　The　wear　resistance　of　the　amorphous　Ni-Fe-P　coatings　was　tested　on　a　Timken　wear　apparatus,　and　the　wear　track　of　the　amorphous　Ni-Fe-P　coatings　as-deposited　and　heated　at　various　temperatures　was　observed　by　SEM.　The　results　show　that　the　wear　resistance　reaches　a　maximum　value　at　NaHPO2　(.)　H2O　concentration　of　5　g/L,　and　heating　at　400　degreesC.　The　wear　mode　of　The　coating　will　change　with　the　heating　temperature　increasing　from　pitting　+　plowing　at　200　degreesC　to　pitting　at　400　degreesC,　and　to　plowing　at　600　degreesC.　The　pits　on　the　worn　surface　of　the　amorphous　Ni-Fe-P　coating　result　from　the　tribo-fatigue　fracture.　The　cracks　of　spalling　initiate　at　pits　and　propagate　at　certain　angle　with　the　sliding　direction　on　surface,　and　then　extend　into　sub-surface　along　the　poor　P　layers　or　the　interface　between　layers.　Finally　under　repeated　action　of　the　stress　in　the　rubbing　process　the　cracks　meet　and　the　debris　forms.　The　generation　of　the　pits　and　spalling　is　related　with　the　internal　stress,　brittleness　and　layer　structure　of　the　amorphous　Ni-Fe-P　coating.