The modern society had two kinds of needs and trends instinctly,simultaneously and objectively,the reform and the revolution,which were interwoven in the same place and may be unified.Through the relapse of reform and revolution,Liang Qichao became aware of the two kinds of need indistinctly;But he stressed in the reform,the understanding of the two kinds of historical needs were biased.In the early period of the Republic of China,he advocated enlightened despotic under the republican system,and he had already found unified ways of the two needs of Chinese modern history that revolution was carried on first,under the advanced state system,reform was carried on and system conformed to the social history conditions was implemented.In a dilemma of reform and revolution,Liang Qichao perceived the modern history law of development.