Based on the development of amphibious aircraft at home and abroad, this paper prospects the future applications of amphibious aircrafts. From the perspective of Flight Performance and Characteristics, Structure and Load as well as Avionics System, this paper generalizes the similarities and differences of several existing airworthiness certification regulations, and analyses their insufficiencies. Finally, suggestions on China"s existing airworthiness regulations including items in the field of take-off characteristics, structure safety, cockpit integration system, water tightness and Anti-corrosion, are proposed to match with the practical structure and task model of the light amphibious aircrafts.