Based on the field data of Tongzhousha and Baimaosha waterway, the historic evolution, recent evolution law and the evolution relationship between Tongzhousha and Baimaosha waterway are analyzed. Suggestions on the regulation, such as regulation key parts and opportunity, are proposed. The research results indicate that the evolution influence of Tongzhousha to Baimaosha decreases gradually, but the diversion of Xuliujing is insufficient, the change of the mainstream of Tongzhousha still exists certain relationship to Baimaosha. As for the regulation, it is suggested that we shall control the left edge of Tongzhousha and Langshansha and the head of Baimaosha as soon as possible.