Abstract: Hard road surface, courtyard and threshing ground and hard ground tamped by manpower are important surfaces of depressed area to collect rainwater. So, it is necessary to study their characters of runoff yield and harvesting. On basis of artificial rainfall simulation in room, author analyzes the time and the initial lost of precipitation for runoff yield, process and harvesting capacity of rainwater catchment. In addition, some factors to influence them are discussed in paper.