The discovery of the intermediate and basic volcanic rocks in Guangxi has important significance in the explanation of the tin ore formation mechanism and the prospecting research. The authors analyzed its volcanic output characteristics, petrology and rock geochemistry. The results show that the volcanic rocks are mainly basalt and andesite. The analysis shows that the ore is closely related to the layered volcanic rocks and shows consistency and continuity with the layered volcanic rocks, and ore sources may be related to the volcanism. It is concluded that the ore deposits in the study area should be of the type of marine volcanic-sedimentary exhalative hot water plus later superposition and alteration.