Taking township as basic unit, the discharge amount and rate of pollution contribution of TN, TP, NH3-N and COD have been researched with the export coefficient model and equal-standard pollution load method. The types of agricultural non-point sources include agricultural plant, rural life and scattered livestock and poultry farming. Results indicate that the main non-point pollution loads in Shenyang are TN and TP. The main pollution sources of TN and TP are scattered livestock and poultry farming and agricultural plant. Among the townships of Shenyang, the discharge amount of non-point source pollution in Kangping, Faku, Liaozhong and Xinmin is larger than that in Sujiatun, Dongling, Shenbei and Yuhong. The exurban zone of Shenyang is the key area to non-point source pollution control and prevention.

Based on goodness-of-fit test on Copula function, we got the best fitted joint distribution function of runoff between D and H reservoirs. Then we analyzed the synchronous asynchronous encounter probability of runoff. The synchronous encounter probability of runoff was 72.46%, while the asynchronous of dryness-wetness or wetness-dryness encounter probability was only 1.06% between D and H reservoirs. The results showed that the runoff conditions were not conducive to the runoff compensation. In order to satisfy the target of water supply, we should also study the reservoir optimization operation, store water in advance and exploit the reservoir regulating potentialities on flood water resources.