Abstract: The discovery of the Baigan Lake W-Sn deposit in the East Kunlun Mountains, Xinjiang, is an important breakthrough in geological surveys and mineral prospecting in the East Kunlun Mountains, Xinjiang, carried out by the Jilin Institute of Geological Survey in recent years. The deposit lies in an accretionary zone between the South China and North China blocks. The deposit occurs in the Paleoproterozoic Jinshuikou Group and is a quartz vein type tungsten deposit. According to its present preliminary controlled perspective ore magnitude, the deposit is expected to be classified as a large-sized deposit. The discovery of the deposit not only is conducive to guiding W-Sn exploration in the East Kunlun Mountains, Xinjiang, but also plays an important roe in promoting the development of the mining industry in southern Xinjiang.