Abstract: The effect of precipitation on runoff in hillslope tea garden in southern area was analyzed to provide a theoretical basis for sustainable and efficient utilization of water resources. The seasonal and annual variation characteristics of precipitation and runoff- yield in tea garden in Anxi of Fujian were analyzed based on hydrological data during 2014-2016. Sediment grain size distribution in water station was analyzed as well. The results showed that: the region was affected by the temperature, and precipitation was concentrated in July and August. Runoff was affected by precipitation and climate resulting in greater distribution differences of runoff during the year; with the soil from wetting to water saturation, the infiltration amount was gradually reduced, and the runoff volume was increased. Scour ability of rainwater to the surface was increased, so that runoff was changed from small amount to large amount, which caused the transportation of large grain sediment. In addition, sediment grain size distribution increased from upper layer to lower layer at the entrance years, increase of human activities also has certain influence on runoff.