A land-sea composite state is a state based on land, close to the continental margin, with a long coastline and a certain degree of influence. In the development of sea-land complex countries, there are respective situations and strategic dilemmas in sea rights. Sea rights are closely linked to national destiny, and after years of development, experience and lessons are both present. France is a representative land and sea composite state. Its thought on sea rights has profound historical value and has made unique contributions to the development of global sea rights theory. Therefore, this paper takes the development of France's sea power as a blueprint and studies the development of France's sea power on land and sea composite countries, discusses the rise and fall of France's sea power, and provides reference for China's sea power strategy research.