The invention provides a steam boiler method for interval design. The steam boiler method involves an upper boiler cylinder, a lower boiler cylinder, ascending pipes and descending pipes, wherein theascending pipes and the descending pipes are connected between the upper boiler cylinder and the lower boiler cylinder, the ascending pipes are internally provided with flow stabilizing devices, and each ascending pipe is internally provided with multiple flow stabilizing devices, wherein the design method comprises the steps that the distance from an inlet of one of the ascending pipes is H, an interval between every adjacent flow stabilizing devices is S shown in the formula, that is, S is a function taking distance H as a variable, S' is first derivative of S, and S' is less than 0. The provided novel steam boiler design method has the advantages that heat transfer is strengthened, the vibration of the ascending pipes is weakened, and the noise level is reduced.