First, the social nature of post-war China has undergone fundamental changes, from a backward, closed but independent feudal country to a semi-colonial and semi-feudal society.

Second, the development direction of China has changed. Before the war, China was a declining feudal country, with a decaying feudal system and gradually developing into a capitalist society. Without external interference, China will eventually become a capitalist country like western powers. After the Opium War, China's national capitalism could not develop normally, China could not develop into a mature capitalist society, and finally chose the socialist road.

Third, the main social contradictions have changed. The main contradiction in China before the war was the contradiction between the peasant class and the feudal landlord class, and the main contradiction after the war included the contradiction between the peasant class and the landlord class, and the contradiction between the Chinese nation and foreign colonial aggressors, that is, the main contradiction in society was complicated.

Fourth, the revolutionary task has changed. The original revolutionary task was to oppose domestic feudal forces. After the war, the task of opposing foreign colonial aggression was added, and the nature of the revolution changed from the traditional peasant war to the old nationalist revolution.