To understand the causes of Chinese suffering is to remember suffering, not just suffering. We should inherit the indomitable spirit of the Chinese nation from the epic history of martyrs fighting against invaders, better uphold the national endowment of self-esteem and self-improvement in the historical position of the new era, be unwilling to yield, be patriotic and self-reliant, and calmly deal with various risks and challenges. In order to stand out. According to relevant public information, it overthrew the three mountains of imperialism, feudalism and bureaucrat-capitalism that weighed on the people of China, and realized national independence, people's liberation, economic development and cultural prosperity.