In the present paper the design procedure of parameters and performances of the pulsing detonation engine with a diffuser and the ejector on different conditions and stages of its operation develops. Construction of numerical methods of a solution of a commitment by definition parameters of flow of yields of a knocking and air to the detonation engine in different instants is carried on. Determining of a general pulse of the detonation engine with a diffuser and the ejector for one clock tick of operation.