In this paper the common submersible pump and the foul water submersible pump were compared with the submersible sand pump. Then, the principle and structure features of the submersible sand pump were introduced. The hydraulic pattern of submersible sand pump was designed according to two kinds of fluid theory. There is an air room at submersible sand pump added. The motor axle of submersible sand pump was extended from the air room. Inside the motor there is a small reservoir and the drop of water can be collected. The working condition of submersible sand pump was improved. The submersible sand pump can work longer time.