Abstract: Yangcheng-Dianmao area is a plain river network area. The orderly flow of rivers and lakes under proper diversion and drainage scheduling is of great significance for flood rational storage, water resources regulation and aquatic environment improvement. Based on the data of flow velocity and water quality measured during regulation experiment in Yangcheng-Dianmao area, this paper uses SPSS software to calculate the relationship between important water quality indicators and flow rate that most directly reflect the orderly flow of water, and further analyze the response mechanism of flow velocity and water quality of the rivers and the lakes under orderly flowing. It is found that the flow rate-dissolved oxygen has the strongest correlation; The flow velocities at water diversion entrances and in the frequently non-flowing rivers are more correlated with the water quality indicators, and the water quality improvement is more significant; The engineering regulation measures can only change water environment in some extent but is hard to generate a direct correlation with water quality. This research can provide technical support for evaluating the actual effect of orderly flowing in rivers and lakes on the environment improvement, and has a positive meaning to improve the water environment under the comprehensive flow regulation of the study area.