For the purpose to get the hydro-geological parameters of Triassic age coal bed 3 of Dongtan Coal Mine,the author analyzed geological and drill log materials,under the condition of being short of the hydro-geological material,found the relationship between wash water quantity in geological log and the hydro-geological parameters,and set up their correlation equation.The hydro-geological parameters of Triassic age coal bed 3 of Dongtan Coal Mine be calculated with it.The comparison of calculated results with the actual data of water irruption quantity showed that the calculated hydro-geological parameters are of practice value.