The Shanhu tungsten-tin deposit in Guangxi is one of the typical Nanling-type W-Sn ore deposits in China.It contains 3 ore types, namely, wolframite-cassiterite-quartz veins, wolframite-stibnite-fluorite-quartz veins and ferberite-quartz breccia veins. 40Ar-39Ar dating of two muscovite samples were collected from the 35 m and 75 m level respectively in Changyingling ore body, and the results yielded the plateau age and the isochron age of (100.8±0.7) Ma, (102.7±1.7) Ma, and (100.2±1.3) Ma, (102.2±2.4) Ma, respectively. These data suggest that the formation age of the Shanhu tungsten-tin deposit is about 100 Ma, i.e., in Cretaceous. The results can help understand the geochronology of tungsten-tin mineralization in northeast Guangxi and the geological dynamic setting.oft-com:office:office" />