There are two paradoxes discussed in Tocqueville's book:Why didn't the revolution take place where the people suffered the most from tyranny?Why did people pursue reform and lead to revolution?These two paradoxes have great enlightenment to the development of contemporary China, such as solving the problems of countryside, agriculture and farmers, and safeguarding the fundamental interests of farmers;We should establish a sense of overall situation and promote a gradual reform model of seeking progress while maintaining stability.Key words: the old system and the great revolution, two paradoxes, enlightenmentsuffer from tyranny.