This research focuses on the theoretical model and experimental design of a Centrifugal water pump. We focused on the pump’s flow rate and exit velocity, which can be used to vary the amount of water and it’s pumped location. In the observation, we discovered different regimes of flow and it’s impact, we discussed them theoretically. In our theoretical model, we first considered the basic centrifugal force and gravity. These two forces describe the basic motion of water. However it couldn’t be used to predict flow rate, then we used the Bernoulli’s equation to calculate pressure difference and Sufficiently considered friction drag during turbulence and straw’s roughness, we also observed excellent fitting with experimental data. We tried simulation with Flow-3D to further investigate our model. We varied 6 different parameters of pump by 3D printing, including angular velocity, depth, length, tilt angle, radius and shape, which were experimentally verified to compare flow rate and exit velocity with the theory, also analysis the possible deviations. Therefore, we were able to design a fully controllable and optimized centrifugal pump.