Compared with transport aircraft, there is less research on emergency evacuation of commuter aircraft after forced landing on water. As more and more commuter aircraft are extended across water, emergency evacuation of forced landing on water has also received attention. Taking the Y12F aircraft as an example, combined with the relevant airworthiness regulations of China and Europe, this paper studies the emergency evacuation technology of commuter aircraft after forced landing on water. By combining theoretical analysis with model experiments, the aircraft floating characteristic, emergency evacuation time, evacuation procedures and related influencing factors are studies. This paper can provide an effective reference for the design of emergency evacuation of commuter aircraft on water in the future.