SiC or TiC particles having the average sizes of 0.27-5.8μm were codeposited in amorphous Ni-P alloy coating on mild steel substrate from chemical Ni plating bath and the wear resistance of the composite coating was investigated using emery abrasion paper as counter material. The wear resistance increased with an increase in the content of ceramics particles and showed the maximum at about 1μm for the size of ceramics particles. When the composite coating was heat-treated at 400°C, the wear resistance was remarkably improved, which may be caused by the crystallization of Ni and Ni₃P phases. At 600°C, SiC composite coating was significantly degraded owing to the reaction of SiC with metal phase, whereas TiC composite coating was stable and kept the high wear resistance.