Abstract: In order to study the metallogenic regularity of the medium-low temperature volcanic hydrothermal deposit，taking the Babaoshan gold-silver deposit located in Longquan city，Zhejiang province as the research example，based on filed geological survey and isotope analysis method，the mineralization belts，ore-forming temperature and prospecting regularity of the Babaoshan gold-silver deposit are discussed emphatically.The results show that:①the regional geological conditions of the Babaoshan gold-silver deposit can be divided into five main mineralized zones，two mineralization types (altered rock type and quartz vein type) and five mineralization stages;②quartz porphyry gold content(2.7×10^-9)of the Babaoshan gold-silver deposit is significantly higher than other minerals，correlation between mineralization degree of the deposit and stratum is low，the mineralization types are controlled by tectonic obviously;③by analyzing the metallogenic temperature，isotopic composition，typomorphic minerals and other characteristics，it is found that the w(Co)/w(Ni) value of pyrite is greater than 1，and As content is high; the sphalerite is iron sphalerite with iron content of about from 3.4%to 6.3%; the galena thermoelectric coefficient varies from-369.2μV/℃ to 619.2 μV/℃; the formation temperature of the main mineralization belts of deposits roughly from 100 ℃ to 300 ℃; therefore，the deposit is the medium-low temperature subvolcanic hydrothermal deposit that related to Yanshan period volcanic(magma).Combing with the ore-controlling factors，it is concluded that the prospecting work should be conducted in the area that the potassium-rich calcium alkali series medium-acid volcanic clastic dyke have strong development and the fault activities，and the key prospecting portion is quartz porphyry exposed area.In addition，the polymetallic sulfide quartz vein should also be paid attention.

Key words: Medium-low temperature volcanic hydrothermal deposit, Geological characteristics, Deposit genesis, Prospecting regularity