Abstract: The spatial distribution and migration pattern of groundwater are important factors to establish groundwater flow system and analyze the seepage field. The SNMR method which is the only geophysical method that can detect groundwater directly can be used to determine the spatial distribution of groundwater, while the SP method is a geophysical method that can detect the flow direction of groundwater. The combined use of these two methods provides a better working pattern for the detection of groundwater. In this research, the detection of landslide groundwater was taken as an example. According to the water content and T1 time distribution obtained by SNMR method, using the semi-empirical method we proposed, the probability value of the slip surface in the underground space could be calculated, and then got the distribution of the slip surface. The flow direction of groundwater in landslide could be measured by the circular observation method of SP method. The combined results of the two methods provided more comprehensive hydrogeological information for the establishment of landslide groundwater model and also certified the effectiveness of the comprehensive application of the two methods.