National defense is an important guarantee of national security. Without strong national defense, there will be no national sovereignty and independence. People's happiness and national rejuvenation will not be guaranteed, which is proved by the painful lesson in China's modern history: it is better to have a country or not to make it stable. It can be seen that the independence of the country and the prosperity of the nation are inseparable from the martial spirit of the whole nation and the construction of national defense forces and reserve forces with strong combat effectiveness. Therefore, national defense is a prerequisite for national independence.

If we want to build a strong national defense, we must understand the security situation around our country. First of all, there are as many as 28 neighboring countries in China, of which 14 is directly adjacent. Secondly, China is an ancient civilization with a long history. Many neighboring countries have deep contacts with China, and historical grievances still have an impact. Third, the diversity around China is outstanding. Fourthly, China's periphery is also a place where the interests of major countries in the world meet. To sum up, the complex background of China's peripheral environment is a factor that China must consider in its peripheral diplomacy.