Sea power is sacred, challenging sea power is evil, and the end of challenging sea power is tragic. This is the revelation left to future generations by the German High Seas Fleet in World War I. After that, all emerging countries set foot in sea power They are all cautious. But is this really the case? Why does the development of a country need sea power? How can emerging powers obtain sea power from established hegemons? This is a question that needs to be certified for every rapidly developing country. In the history of war, I hope that the roar of the giant ship's cannon can bring a little enlightenment about sea power.