Located in Dongru Township, Ritu County, Ngari Prefecture, Tibet, Jieze Chaka Salt Lake has 2.3 million tons of LiCl resources, 1.6 million tons of B2O3 resources, and 9.79 million tons of KCl resources. It is one of the few lithium mines under development in Tibet. It is of great significance and scientific value to study the material source of the salt lake water and its recharge water. This paper systematically analyzes the Gezechaka salt Lake and its recharge water by means of hydrogeochemical methods. A total of 65 samples of lake water, river water and spring water were collected to test their TDS, pH value and main ion composition. The main ion characteristics, control mechanism and source of lake water and recharge water were studied by Chadha hydrochemical diagram, Piper Cationonic triangle diagram and Gibbs diagram. The results show that the chemical type of salt lake water is Na-CO3, the chemical type of river water is Ca-Mg-HCO3, Na-HCO3, and the chemical type of spring water is Na-HCO3. The composition of hydrochemical ions is mainly affected by rock weathering and evaporation-crystallization. Na+ and K+ of river water and spring water are mainly derived from evaporative karst decomposition such as rock salt, and Ca2+ and Mg2+ are mainly derived from the dissolution of silicate rock. Metallogenic materials such as Li, Rb and Cs come from rock weathering and deep water-rock reaction. The annual replenishment of Hebian Spring, Dongru Spring and Qingshui River is 1,601,600 m3, 6,440,900 m3 and 93,616,500 m3, respectively. River water replenishment accounts for 92.09%, and the annual replenishment of Li, Rb and Cs in river water is about 3501.26kg, 176kg and 156.34kg. The annual replenishment of Li, Rb and Cs in spring water is about 6824.18kg, 288.87kg and 691.59kg, which are mainly spring water replenishment, accounting for 66%, 62% and 82% respectively. Chaka mud fields and membrane fields with an area of about 10.40km2. After extraction of lithium and potassium, the concentration of rubidium cesium in the brine gradually enriched, reaching the requirement of separate mining grade of rubidium cesium in Zabye Salt Lake. The water level of Geze Chaka Salt Lake has risen and its area has expanded. In April 2023, the area of Geze Chaka Salt Lake has reached 118.07km2, an increase of 12.69km2 over 1977, which has had a certain impact on the production of the salt lake. It is recommended to continuously monitor the dynamic change of the lake water.