In order to find Pb-Zn-Ag ore deposits in plains, geo-electrochemical exploration is carried out in Hardattolgoi lead-zinc-silver ore deposit. In the feasibility experiments of electrochemical dissolution and geo-electrochemical exploration in the Abag County, Inner Mongolia, Zn, Pb and Ag can produce intensive electrochemical solution, and anomalies synchronously on the ore bodies. The geo-electrochemical anomalies are found to range in the order of Zn>Pb>Ag value. By the geo-electrochemical method, twelve Zn, eight Pb, and seventeen Ag anomalies are found in the studied area. According to geological background, three exploration targets (A, B, C) are divided, and target A is the best one.