As global flights across the sea become more and more frequent, water landing of civil planes has gradually become a key focus for airworthiness certification authorities both at home and abroad. Starting from the basic concept of water landing for civil aircraft, referencing to relevant literatures at home and overseas and requirements for airworthiness clauses of water landing, as well as combining with the experience and lessons of water landing airworthiness, this article provides some airworthiness certification requirements and research thoughts about emergency equipment, emergency exit, maximum passenger capacity, emergency evacuation time and floating time of airworthiness compliance verification of civil aircraft landing on water. The article focuses on the deep-seated requirements contained in the airworthiness clauses of water landing and different ideas and methods for verifying airworthiness compliance under two circumstances: not applying for water ditching certification and applying for water ditching certification. In order to meet the requirements of airworthiness certification, it is necessary to pay attention to the issues that must be considered in the early stage of aircraft design,in the hope of to providing some reference for the development of other domestic aircraft types in China.