Abstract: Pulse electroplate chromium on 30CrMnSiA alloy was investigated with the special pulse plating apparatus in standard chromium plating bath at the temperature of 50±1℃, 55±1℃ and 60±1℃ respectively. The mircohardness and thickness were measured by SEM, metallographic microscope and MVC-1000JMT1 microhardness gauge. The coating porosity and bond strength of the chromium coating electroplated were tested at different temperature by the methods of filter paper and three-point bending. The results show that the effect of the electroplating temperature on microstructure, microhardness and thickness of the pulse chromium coating was very remarkable. The evolution of the coating grain size was a function of the electroplating temperature and the coating grain became fine with the increase in temperature. Compared with direct current electroplating, the pulse electroplating was better than direct current electroplating in terms of coating porosity, coating conjugation power, microhardness and thickness. A dense, slick surface of chromium coating with low coating porosity, and without tumour was produced at 60℃.