A tailings pond in Guangxi Province was chosen as the study area． Groundwater tracer test was carried out to obtain the time-concentration curves． The velocity of groundwater flow，coefficient of dispersion，and dispersity were obtained by means of the groundwater dispersion model developed using the data from the test． The mechanism of multimodal and double-humped curves was also analyzed． The experimental results show that the calculated flow velocity was in general close to the apparent velocity． The leakage path with the giving and receiving locations of the tracer，the direction of groundwater flow，and hydraulic connection matched well with the observations． The method can provide technical references for future water pollution evaluation and construction of trailings ponds．