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Compressible-incompressible flows such as gas-liquid two-phase flows and jets are very interesting phenomena. The construction of a method which is able to analyze complex phenomenon is expected to be applied to various real phenomena. The purpose of this study is to simulate the flow in the pressure tank of a water rocket with gas-liquid two-phase flow. First, we developed a coupled calculation method for compressible flow and incompressible flow. Next, the calculation just before the gas-liquid two-phase flow was performed and compared with the experiment, and a reasonable thrust was obtained.