The Ni-diamond composite coating was prepared by a two-step method. The uniform diamond particles was first electrophoretically deposited on a copper substrate. Nickel was then electrodeposited in the second step onto the substrate covered with the diamond particles. The two-step method enabled us to incorporate 48 % ( wt% ) of diamond particles into the nickel matrix. Compared with pure nickel coating under the wear experiment, the wear amount of the Ni-diamond composite coating was very small . The counter-grinding piece of the composite coating was 17 times than pure nickel coating. The result indicated that the composite coatings prepared by this method had a better anti-wear performance.