The main purpose of building China into a maritime power is to obtain enough overseas resources to support the country's development, which can be seen from the offshore oil transportation in China. The second is to get enough market space, because shipping is the most important mode of maritime transportation, so it can effectively compete for overseas markets. Third, safe space. China coastal economic zone can be effectively protected by building a powerful maritime force. At the same time, we can use the advantage of free navigation on the high seas to push the local military forces away from home, and we can obtain effective means to directly attack the enemy's home.