Shaizhudong spring is the largest karst spring in the central of north of the Weihe River, Shaanxi Province, China. A lot of studies have been done for investigating the recharge source of it. The most common understanding was that the leakage of Jinghe was the main recharge source for Shaizhudong Spring which is the concentrated discharge point of hidden karst system in the catchment area of Shaizhudong Spring. However, with the method of hydrogen and oxygen isotopes, and combining the condition of hydro-geochemistry and karst hydro-geology, we have different opinions on the recharge source of Shaizhudong Spring. This study shows the result that the recharge of Shaizhudong Spring is given priority by karst groundwater which is outside the southwest of the Shaizhudong Spring area.
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