The work aims to find a better way for swimmers to save themselves from drowning through the redesign of the drowning self-rescue products. Guided by the self-rescue needs of drowning people, observation, recording and experimental comparison of various physiological phenomena of drowning people were carried out by using observation method and situational analysis, determining that "coughing" was the only phenomenon that could effectively judge drowning. With the help of the consistency of throat muscle movement during "coughing" and "swallowing", the swallowing monitoring technology was used to indirectly identify the occurrence of "coughing", and the feasibility of using swallowing monitoring technology to identify "coughing" in the underwater environment was verified through experiments. The results showed that the "coughing" signal in the drowning state showed a characteristic change pattern and was significantly different from the normal "coughing" signal. In conclusion, the swallowing monitoring technology can accurately identify the drowning state, and can be effectively applied to the design of drowning self-rescue products. It improves the success rate of self-rescue and reduces the occurrence of drowning accidents.