Abstract: This paper deals with the results of pressure and solution tests on rock samples in order to provide an experimental basis for earthquake prediction using radon anomalies. Based upon the general determinations of radon concentration in ground water from the Tangshan area, the authors on the samples collected from the wall rocks and wells made a comprehensive study of the uranium (thorium) content in the rocks and the relationship between the radon concentrations which were escaping from the broken rocks by pressure ordis solving in water and existing in wells. The authors suggest that the higher the content of radioactive element in wall rocks of the wells is, the larger the escaping radon amount from the broken rocks; the more the radon amount solved in water of the broken rocks and the higher the radon concentrations in ground water of the wells will be.