Objective:To investigate the acute stage of cerebral hemorrhage etiology and pathogenesis. Methods:To discuss the ancient literature of Chinese medicine,modern research of Chinese medicine and animal experiment results,the acute stage of cerebral hemorrhage etiology and pathogenesis is comprehensively analyzed and investigated,combined with our clinical experience.Results:Factors of etiology and pathogenesis in the acute stage of cerebral hemorrhage firstly is the stagnated blood of brain,and then stagnated fluid of brain,and eventually becoming the water stasis. Conclusion:The acute stage of cerebral hemorrhage etiology and pathogenesis is caused by water stasis.