Chengmenshan copper deposit, located in the southeastern part of Jiurui copper-polymetallic mineralization concentration field, is a typical stratabound massive sulfide copper deposit.EH4 electromagnetic sounding helps the authors to achieve remarkable results in the chengmenshan mining area because it can reflect expansion state of the strata and the low resistance body clearly and this result can be used in the deep and peripheral of Chengmenshan mining area. This paper finds a clearly electric anomaly related to mineralization. It not only achieves the goal of estimating exploration area prospecting potential but also confirms that EH4 electromagnetic sounding is an efficient and practical exploration method to investigate stratabound massive sulfide copper deposit.