Trench cutting re-mixing deep wall (TRD method) is a new construction method introduced from abroad in recent years. In this paper, combining engineering case, TRD method is introduced about its wall construction theory, construction technology, main points of construction and the application scope and the analysis is made on its advantages and disadvantages in practice application. The engineering practice proves that TRD method has obvious technical superiority in retaining and seepage prevention of foundation pit engineering.