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This study deals with a hydraulic characteristics in the mobile circular Venturi flume that is the discharge measured structure. Especially, this study mainly focuses on the submergence effect due to tailwater depth by using a three-dimensional numerical model, FLOW-3D. The simulation results for the model verification are in good accordance with the existing experimental results. The tailwater depth does not affect the discharge by the time when 0.7 and the tailwater depth begins to influence the discharge, that is, is about 0.95 in the case of 0.8. And the influence is more and more on the increase when 0.8. Furthermore, the influence is more severe as the upstream boundary stage, , is high.