With the increasing frequency and intensity of maritime operations and the frequent occurrence of maritime safety accidents，deep-sea salvage and rescue are becoming increasingly important. Taking the U.S. F-35C fighter plane crash in the South China Sea as an example，the paper sorts out the related devices and processes of the deep-sea salvage in detail，focusing on the analysis of the marine environmental factors that affect the deep-sea salvage operations. The operational ocean products are used to compare and analyze the similarities and differences of marine environment parameters during the three different times when F-35 fighter plane crashed into the sea. Suggestions are put forward to strengthen our country's ability to conduct deep-sea salvage missions at the end of this paper.