It is very important to study the factors that affect the change of different forms of heavy metals in soil so as to understand their geochemical behaviors. In this paper, the typical soil in Yantai gold ore district and surrounding areas was described, organic matter, clay, the relationship and the ecological harm of magnetic susceptibility and pH in soil with different forms of heavy metals in soil were also discussed. Some conclusions have been reached: the main existing forms of heavy metals are residual state and Fe-Mn oxide state, whereas the main existing form of Cd is ionic exchangeable form;soil acidification may increase the content of Ni, Zn, Cd and Hg in activity form; if the soil is seriously polluted by Pb, the maintenance of an alkaline environment can reduce Pb harmfulness, and the prevention of salinization is an effective measure for eliminating As pollution in soil. The improvement of organic matter content may reduce the active state form content of Pb, Hg and Ni, whereas the increase of clay content may slightly reduce the percentage of ionic exchangeable form of Pb, Zn; soil magnetic susceptibility is a fairly ideal indicator for acidification situation and pollution degree of soil.