Choosing the Xiaoyan Cave located on Yaji Karst Experimental Site in Guilin and the above catchment slope as research area, this paper made a study via conducting dynamic monitor of the slope runoff and cave shaft flow in different rainfall conditions, the results show that (1) The slope runoff and vadose zone hydrologic dynamic change process in karst mountainous areas are decided by rainfall intensity, rainfall duration and the condition of the water-bearing medium prophase water situation; (2) In different rainfall conditions, the hydrologic dynamic changes of slope runoff and cave shaft flow rise and fall rapidly, and the slope runoff even more rapidly than the cave shaft flow. In general, the hydrologic dynamic change process of slope runoff last for a few hours to ten hours, but the cave shaft flow can last one to three days; (3) When the time of heave rain or downpour, the slope maximum runoff is greater than the cave shaft flow, but the water volume in slope runoff are less than the cave shaft flow due to the short duration of the slope runoff hydrology dynamic.