Key points of the answer (1) Comparison between China and Britain: ① Politically, Britain established a capitalist system in the17th century, while China was still in a feudal society, with the decline of the Qing dynasty, political corruption and sharp class contradictions. (2) Economically, Britain completed the industrial revolution in the first half of the19th century, developed great productivity and became the number one capitalist power; China was still dominated by natural economy, and the Qing government had financial difficulties, making ends meet. (3) Militarily, British ships are powerful, holding maritime hegemony and actively carrying out foreign colonial expansion; In China, however, the troops of the Qing Dynasty were outdated in equipment, not diligent in training and corrupt in discipline. The rulers of the Qing dynasty closed their doors to the outside world and were arrogant. (2) Changes in China society caused by external factors: ① Changes in the main contradictions in China society: from the contradiction between the landlord class and the peasant class to the contradiction between foreign capitalism and the Chinese nation, feudalism and the masses of the people. ② Changes in social nature: China began to become a semi-colonial and semi-feudal society. (3) The economic aggression of foreign capitalism led to the disintegration of China's self-sufficient feudal economy, which involved the China market in the world capitalist market and stimulated the emergence of China's capitalist industry. (4) The invasion of foreign capitalism broke the feudal closed state of China, which made a group of advanced China people such as Lin Zexu and Wei Yuan face up to the reality and set off a trend of learning from the West. The invasion of foreign capitalism also split the feudal ruling class, and some bureaucrats set off a westernization movement aimed at learning advanced western technology and maintaining the rule of the Qing Dynasty.