The advantages of SiC power device is introduced,and it is used for high power LD driver.The switch parameters and dynamic characteristics of the SiC MOSFET were analyzed,then a simple and practical isolated drive circuit was designed.A 120V/120A all-SiC LD driver power module was proposed,and its main circuit uses Four-way interleaving Buck circuits,the switching tube and the diodes in this circuit all use SiC devices.In addition,the maximum efficiency of the all-SiC module can reach up to 98% and it has a high reliability.