Abstract: Based on the data of Dengyingyan Hydrologic Station, efforts were focused on the Tuojiang River to analyze the yearly and inter-annual changes of the runoff by means of Statistical Analysis Method and Cumulative Average Method. And the analysis of the data of the late twentieth century shows that the Runoff Distribution of the year is not even and of a typically seasonal variation in Tuojiang River, over the years it changes gently, taking a slightly descending tendency. 〖JP2〗The findings are of a strong realistic value and provide a theoretical basis for the long-term development and utilization of water resources.