20世纪上半叶在以战争与革命为主题的时代背景下 ,外国帝国主义的侵略和俄国十月革命对中国社会发展产生了重大影响。半殖民地半封建的社会形态、错综复杂的阶级结构和阶级关系、2 0世纪中国的两大历史主题等也是制约中国社会发展的重要因素。正是由于对这四个因素的正确认识和准确把握 ,中华民族实现了 2 0世纪上半叶中国社会的巨大变革 In the first half of the 20th century, under the background of the theme of war and revolution, the aggression of foreign imperialism and the Russian October Revolution had a significant impact on the development of China’s society. The semi-colonial and semi-feudal social forms, the complex class structure and class relations, and the two major historical themes of China in the 20th century are also important factors that restrict the development of China’s society. It is precisely because of the correct understanding of these four factors and an accurate grasp of the Chinese nation to achieve the great transformation of Chinese society in the first half of the 20th century