Abstract: Multi-scale wavelet analysis theory is applied to study water inflow in mine face, spontaneous potential and water level of directly water-charged aquifer.It is found that there exists close relationship among these three types of data by wavelet decomposition and reconstruction.The regularity in the 2nd signal of the low-frequency reconstructing is that spontaneous potential rises due to water level fall, causing increased water inflow when the water level rebounds and spontaneous potential reduces as well as the corresponding water inflow reduces.The regularity in the 2nd reconstructed signal of low frequency is that high water level and low spontaneous potential are corresponding with small water inflow, low water level and high spontaneous potential are corresponding with large water inflow.