sui dynasty
china was reunified in a.d. 589 by the short-lived sui dynasty （a.d. 581-617）， which has often been compared to the earlier qin dynasty in the ruthlessness of its accomplishments.
the sui dynasty's early demise was attributed to the government's tyrannical demands on the people， who bore the crushing burden of taxes and compulsory labor. these resources were overstrained in the completion of the grand canal，and in the undertaking of other construction projects， including the reconstruction of the great wall.
weakened by costly and disastrous military campaigns against korea in the early seventh century， the dynasty disintegrated through a combination of popular revolts， disloyalty， and assassination.
隋朝
公元589年-隋朝，中国再次统一了。隋朝（公元581-617）的统治时间很短，人们因它残暴的统治而常常把它比作是早期的秦朝。
隋朝的迅速消亡是政府对人民进行残酷统治的结果，人民承担着沉重的苛捐杂税和义务劳动。人民不堪重负，在开凿大运河、重建长城、修筑其他的许多建筑等工程中耗尽了体力。
7世纪早期，隋朝因耗资巨大但损失惨重的对朝战争而实力大减，同时连续不断的大型起义、暗杀活动和皇室内讧更加速了隋朝的分裂。