In aluminum alloy chemical plating process, temperature is one of the most important factors which directly affect the coating speed and quality. With the change of temperature with speed, so temperature is an important factor which affect the deposition speed. Therefore, to measure and study the influence on temperature to the quality of coating and plating speed is of important theoretical and practical significance. Using scanning electron observe the surface morphology of coating. Spectrum analyzer detects the surface content of Ni- P; then corrosion resistance of coating is detected, and thus the optimum temperature is determined.