Abstract:Magmatic hydrothermal activity has a direct or indirect relationship to mineralization. As one of the three major elements, magmatic rocks has been attached great importance to by geologists. In recent years, the theory of small intrusive bodies forming large deposits which put forward by Academician Tang Zhong-li has played a great role in geological prospecting practice. The intense magmatic activity in tonghua area of jilin province forming a series of batholithes (magmatic rocks), stocks (small intrusion bodies) and intermediate-acid dikes. In the past, geologists paid attention to the mineralization of large magmatic rocks in regional geology and mineral exploration, while small intrusion bodies is often ignored. Taking the Weishahe intrusion group as an example, uses the theory of "small intrusive bodies forming deposits of geophysics and geochemistry, the author thinks it have the prospecting potential to find copper- gold-molybdenum polymetallic deposits for the rule of "small" and "extensive".