This paper introduces a method of designing the diameter and flow rate of the outlet pipeline of variable head water flow standard facility based on CFD method. And the procedures of geometric model design, mesh generation, parameter setting and numerical calculation are illustrated. Then it is concluded that the instability of the gas-liquid interface will not occur in the facility in the process of water falling, under the condition of the maximum design flow rate of 25000m3/h and the outlet pipeline of 3.0m diameter. Then it is also found that there is possibility of further expanding the diameter and flow rate of the standard facility. The numerical result has practical significance for the design and flow field analysis of the variable head water flow standard facility with diameter-change section in the main water tower.
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