Underwater robots are widely used in ocean engineering and deep-sea exploration. Due to the complex and harsh sea conditions of FPSO operations， the release and recovery of ROV is an important factor affecting its operational capability. We Shcald select the optimal storage and retrieval method based on the characteristics of the homework and the weight of the underwater detection device, collect data on the sea conditions in the target sea area, analyze the motion response of underwater detection devices in the operating sea area, and use the normative method to verify the structural strength of the work cabin in different states. This article takes the implementation of FPSO work cabin in Lufeng 12-3 oilfield as the background. By using AQWA software to establish FPSO and underwater detection device models， the hydrodynamic response analysis of underwater detection devices， ships and their mooring systems is carried out， and compared with experimental values. The simulation analysis and experimental results are close and reliable. Finally， based on the motion amplitude of the underwater detection device under the most dangerous working conditions， the appropriate boom stroke is selected.