Refuting Kang Youwei's book "On Revolution" is a movement against royalists' remarks and advocating revolution. The background is that since Eight-Nation Alliance invaded China, advanced intellectuals and young students took the opportunity to oppose the Russian occupation of northeast China and the sale of territory in the Qing Dynasty, and put the overthrow of feudal system and the establishment of bourgeois democracy on the agenda of reforming China. In this situation, Kang Youwei published the Reply to the North-South American Revolutionary Book on the Feasibility of Constitutionalism in China in 1902, trying to prove that it is absolutely impossible for China to realize democracy, so it is absolutely impossible to give up hope on Emperor Guangxu. This article became the royalists' declaration of war and the general program against revolution. In order to systematically liquidate the royalist system in theory and actively clarify the necessity and inevitability of democratic revolution, Zhang Yu 1903 wrote a book "Refuting Kang Youwei's Revolution", which shouted loudly for resisting the threat of imperialist partition and overthrowing the decadent Qing Dynasty by revolutionary means, and played a significant progressive role at that time.