At present, there are still the following problems in the development of ROV in my country: First, there is a lack of research on the systematic planning and development of ROV equipment and technology, and there is not enough leadership for the innovation and development of ROV; second, the development of key special equipment for ROV lags behind the development of overall integrated technology. Key equipment/parts such as manipulators and sensors rely on imports; third, the industrialization process is slow, and most domestic. From the analysis of the existing modeling, China's ROV has the following problems: 1. The center of gravity is high and the overall modeling is not flat enough; 2. The track lacks protection; 3. The scientific theoretical methods such as fluid mechanics and bionics are not reflected in the modeling; 4. The internal parts are exposed, which has certain resistance to the later commercialization. Therefore, this design study decomposes the ROV task, and through the deliberation of the sketch, the following two design schemes are obtained.