Abstract: In order to study the chemical characteristics and control factors of groundwater in suntuan goldfield, 31 groups of water samples in suntuan goldfield are successively collected, and the chemical characteristics of groundwater in suntuan goldfield are systematically analyzed by means of mathematical statistics, Piper's three-line diagram, correlation analysis, Gibbs model and ion proportional coefficient and other methods. The results show that: PH 8.4 on average, each aquifer in the study area water quality is weak alkaline, cation is given priority to with K++Na+ in each aquifer, anion SO42- and HCO3- primarily, TDS with an average of 976.77 mg/L, 7~8、10 coal and coal aquifer water quality type of HCO3-Na+K type and HCO3·CL-Na+K type, the water quality of taiyuan group limestone aquifer types for HCO3·CL-Na+K·Mg, the ordovician aquifer water quality type of SO4·HCO3·CL-Na+K·Ca·Mg, Water samples in Gibbs figure and principal component analysis showed that the distribution in each aquifer of ion controlled by rock weathering dissolution and human activities on water chemistry affect smaller, than in the aquifer HCO3- ,Na+ and K+ mainly from potassium feldspar, sodium feldspar dissolution of silicate minerals, such as Ca2+ and Mg2+ mainly controlled by the carbonate and sulfate minerals.