Abstract: Abstract：In order to understand surface runoff in deep hilly region of northern of Sichuan province, Lizikou catchment acted as the research area in Jialing River watershed. Based on the observed rainfall and runoff data from 2005 to 2016, correlation analysis, elastic coefficient of precipitation and flow duration curve applied to reveal the change regularity and correlation between rainfall and runoff. The results were as followed: (1) Annual precipitation and runoff was uneven distribution under inter-annual scale. The increase tendency of precipitation and runoff was not significant. The increase tendency of runoff is less than that of rainfall. (2) The monthly distribution of rainfall and runoff is extremely uneven. From June to September, the rainfall and runoff depth accounted for 67.4% and 78.5% of that in whole year, respectively. As a result, it prone to flooding in summer. (3) Extremely high flows, normal flows and extremely low flows were 2.9, 0.2 and 0.01 m ³/s, respectively. Extremely high flows caused by prolonged rainstorm. Normal flows often emerged during no rainfall in the wet year or during the heavy rain and rainstorm in the dry year. Extremely low flows were mostly due to no rainfall or only a small amount of rainfall. (4) In the typical individual rainfall, the flow during curve under heavy rain, moderate rain and light rain transferred from sharp-thin to flat. The lag times for peak flow ware 1.5 h, 3.67 h and 5 h for light rain, moderate rain and heavy rain, respectively, which became longer with the decrease of rainfall. Peak flow became lower with the decrease of rainfall. All in all, the correlation between rainfall and runoff is extremely significant in yearly, monthly, and daily (P<0.01). There are great differences among different time scales.