In order to ensure the safety of the newly designed spliced yacht trailer frame,simulation analysis was conducted on the yacht trailer frame.The structure of the yacht trailer frame was introduced,and six simulated working conditions were set up to analyze the stress distribution of the yacht trailer frame,then,the optimization design was carried out based on this analysis.The simulation analysis result shows that the original design just meets the usage requirement.Through optimization design,the safety factor raises from 1.19 to 1.48.