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...Advances in biological sciences research volume international conference on engineering and pharmacy bep review rainfed agriculture rainwater harvesting techniques ziye liu junying jin class shahe no middle school department of hydrology water resources hebei province china beibei chongqing e mail qq com junyingjin abstract this paper summarizes the importance fig rather it is extreme variability rainfall resource more serious situations facing with high intensities few rain events poor agricultural use a necessary way spatial temporal distribution for crop production food security as one most efficient tool can supplement hence enhance productivity however comprehensive understanding multidisciplinary study are needed to improve efficiency keywords management i introduction worldwide has been undergoing changes due population growth urbanization economic development issue climate change adds new dimension ongoing dynamics supply demand reductions have observed lower tropical latitudes...