Abstract: SAMT method has been developed since middle 1980's, is featured by its high sensitivity, large depth of detection, and strong ability against interference, and be widely used in prospecting resources and bad geologic body. The principles of CSAMT method are introduced simplly, and CSAMT method has been applied to explore cavity in gold mine of Tibet. Based on relative geologic information, geologic interpretation has been given for measured mine, and the prospective ore-bearing zone has been carved up for further gold exploration.