Nanocrystalline　(nc)　Ni-Co-Fe-P　alloy　coatings　were　synthesized　by　pulsed　electrodeposition.　The　structure,　surface　morphology　and　composition　of　nc　Ni-Co-Fe-P　alloy　coating　were　studied　by　XRD,　TEM,　SEM　and　EDS.　The　effects　of　alloying　with　phosphorus　and　subsequent　heat　treatment　on　the　wear　resistance　of　nc　Ni-Co-Fe-P　alloy　were　studied　using　a　friction-wear　tester.　The　results　indicate　that　the　grain　size　of　nc　Ni-40.41%Co-6.16%Fe-1.63%P　alloy　coating　was　only　8.3　nm,　and　the　hardness　and　wear　resistance　of　nc　Ni-Co-Fe-P　alloy　were　higher　than　that　of　nc　Ni-Co-Fe　alloy　coating.　The　hardness　and　wear　resistance　of　nc　Ni-Co-Fe-P　alloy　were　improved　by　heat　treatment.　There　was　a　positive　relationship　between　the　wear　resistance　and　hardness,　and　the　wear　mechanism　changed　gradually　from　abrasive　and　adhesion　wear　to　abrasive　wear　with　increasing　hardness　of　nc　Ni-Co-Fe-P　alloy.