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Underwater vehicles have become an important tool to develop oceans. The design of the shape, hardware circuit and software of a water jet propulsion spherical underwater vehicle was introduced, and the characteristics of water jet pump were presented. The design of the thruster and computation of the thrust was proposed, too. A desired movement result was achieved by the designed spherical underwater vehicle in static water experiments. The experiments proved that the design was feasible, and the spherical underwater vehicle could be regarded as a carrier for further research on correlative control algorithm.