At that time, coastal defense was dominated by coastal defense. With the development of society, coastal defense construction has gradually become an important part of national security.

Coastal defense construction is an important part of national security and an important means to safeguard national maritime rights and interests, territorial sovereignty and national security. Coastal defense construction, including coastal defense strategy, coastal defense engineering, coastal defense management, coastal defense equipment, etc., is a comprehensive system engineering.

China's coastal defense construction has experienced many stages of historical development. During the Shang and Zhou Dynasties, China coastal areas began to build defensive facilities such as city walls and beacon towers to resist foreign invasion. Since then, with the development of society and the progress of technology, the coastal defense construction in China has gradually formed a defense system with coastal defense as the main body.

Since modern times, China's coastal defense construction has formed a relatively perfect defense system. In terms of coastal defense strategy, China has formulated a foreign policy of "peace and development" and adhered to the road of peaceful development, but at the same time, it has strengthened its maritime defense capability and maritime security guarantee capability.

In terms of coastal defense projects, China has strengthened its coastline defense capability, infrastructure construction in coastal areas and maritime traffic support capability. In terms of coastal defense management, China has strengthened the construction of maritime law enforcement team, strengthened maritime safety supervision capability and enhanced maritime emergency rescue capability. In terms of coastal defense equipment, China has strengthened the construction of maritime equipment and enhanced its maritime communication support capability.

Significance of coastal defense construction:

1. Defending national security: Coastal defense construction is an important part of national security and is of great significance to safeguarding national sovereignty, territorial integrity and security. Only a strong coastal defense force can effectively resist foreign aggression and threats and safeguard national security.

2. Promote economic development: the ocean is an important resource of the country, and strengthening coastal defense construction is conducive to protecting marine resources and promoting marine economic development. At the same time, maritime transport is an important support for national economic development, and it also needs strong coastal defense forces to ensure the safety and smoothness of maritime traffic.

3. Enhance international status: Having a strong coastal defense force can enhance the country's international status and international influence. In international affairs, countries with strong coastal defense are more likely to be respected and valued, which is more conducive to safeguarding national interests.