Abstract: By means of the study of T、D、¹⁸O and ¹³ C in the underground water in Guhanshan coal mine field, the criterions to indentify the recharge source of the underground water of the main aquifers in this field are set up in this paper, which will be coefficiently used for ascertaining where the mine water comesfrom, alluvial aquifer, Ordovician Karst aquifer, and the thin limestone aquifel, in coalbearing strata, and will provide with the basis for identifying the recharge source of inrushing water during coal mine construction and exploitation.