Students, when you are sitting in the classroom happily, have you ever thought that countless revolutionary martyrs exchanged their blood and lives for your happy life today? It is the uncle of the People's Liberation Army who climbs the ice and lies in the snow, not afraid of cold and heat, not afraid of bloodshed and sacrifice, always ready to fight against the enemy's invasion, ensuring your normal study today. It is precisely because our country has a strong national defense force that the people of the whole country have a peaceful environment and can live, study and work with peace of mind.

In order to help students establish the national defense concept of "being prepared for danger in times of peace" and inspire everyone's spirit of loving the army and practicing martial arts, devoting themselves to national defense and working hard, we have compiled this set of national defense education textbooks.

This set of teaching materials highlights different educational characteristics according to different age stages. In primary school, it mainly introduces some basic national defense knowledge; The junior middle school will systematically introduce the origin of the Chinese nation and its unification process, introduce the humiliating modern history of China and the arduous course of China people's heroic resistance to foreign aggression, and introduce the national defense situation of China People's Liberation Army and New China. It will also focus on teaching some national defense knowledge, such as the concepts of state, national defense and national defense education, the meaning and relationship between war and peace, local wars under the current high-tech conditions in the world, the current international military situation, military science and technology knowledge, military geography knowledge, three defenses knowledge, and new weapons knowledge.