The channel regulation should be implemented at appropriate time before the navigation condition is deteriorated.Taking the regulation of the Dayu beach in the Huaihe outfall waterway (Hongshantou to the Grand Canal section) as an example,various erosion schemes of the head of Dayu beach are calculated by a two-dimensional flow model.The consequences without protection at the head of the beach are analyzed which explains the necessity of protection.At last,combining with the recent river evolution,a beach regulation layout plan is proposed.This method may serve as reference for the decision-making of the regulation plan.