Based on gravity and magnetic, geological and mineral resources data, this paper described characteristics of aeromagnetic and gravity anomalies in Tunxi area and, in combination with physical characters, analyzed geological factors responsible for the aeromagnetic and gravity anomalies and their reflections for geological structure and mineral resources. Gravity and magnetic anomalies are very clear in Tunxi area, which reflect the distribution regularity of basement, capping bed and intrusive rocks. It is held that Tunxi basin is a Paleozoic basement and hence the prospecting space can be considerably enlarged. It is also considered that Zhuxi type superlarge skarn tungsten-copper deposits are likely to be found in the Paleozoic basement of the red bed basin.