1.The Chinese navy plays an important role within the whole offshore active defense process. It is not only the main force of the sea force, but also the ultimate coordinator for the air force, the army, and marine. The CCP's counter-participation strategy is actually a type of offshore active defense. This type of combat combines the forces of the four areas: land, air, sea, and submarine. The mode of warfare is to combine regular and non-regular methods of warfare. Among them, the submarine fleets are responsible for the non-regular method for operations. 2.The CCP's nuclear power submarine warfare units were located on the North Sea and the South China Sea. In the North Sea, the main purpose is to protect the capital and the main area of ??Beijing. In the South China Sea, it may be used as a scout for the surface fleet, or with its aircraft carrier fleet to perform ambush missions.