Objective To investigate the effect of CuSO4 concentration and micro-arc oxidation process parameters (voltage, oxidation time) on the color and properties of the micro-arc oxidation coating. Methods TC4 titanium alloy was treated in sodium phosphate electrolyte to obtain a surface ceramic coating by using micro-arc oxidation technology. The macroscopic and microscopic morphology, phase structure and hardness of the oxidation coating were analyzed. Results By adding of CuSO4 of different concentrations, the color of coating samples was darkened which turned from gray to red-brown when the CuSO4 concentration was increased. The surface coating was uniformly dense with the highest microhardness of 627. 1HV when the concentration of CuSO4 was 0. 5 g / L. And the coating microhardness was decreased to the lowest 382. 8HV when the concentration of CuSO4 was 1. 5 g / L. With the increasing of voltage, the color of coating got deeper and more uniform, while the coating hardness decreased. The hardness of coating was the lowest and the color was the most uniform at 400 V. When the oxidation time was prolonged, the coating thickness was increased and the color became deeper and more uniform. However, the coating color tended to be lighter when the oxidation time was over 15 min. Conclusion CuSO4 has significant coloration effect on micro-arc oxidation coating and the concentration and process parameters (voltage, oxidation time) have great influence on performance, color, density, thickness and phase structure of the coating.