Mobilestate element is a general method in deep penetrating geochemical survey. Water leaching state of elements is one of the most active state of mobile elements. In this paper, experiment of geochemical measurement under water extractable phase of copper in Beilou area in Zouping county of Shandong province has been introduced, and the effectiveness of the method has been evaluated. As showed by the experimental result, the anomaly of water leaching state of copper can agree with hidden copper deposit. Thus, the position of abnormal drilling verification has been put forward.