Objective To study sedative hypnotic pharmacodynamics of Shui'an Capsule,and provide experimental basis for the expansion of clinical indications.Method The effects of different concentrations of Shui'an Capsule on spontaneous activity of mice,induced dormancy of the mice with subliminal and suprathreshold dose of sodium pentobarbital and resisted convulsions of mice caused by Dimenlini Hydrochloridum were observed.Result Shui'an Capsule could significantly decrease times of spontaneous motion in mice,prolong sleeping time with pentobarbital sodium of superthreshold dose,and decrease the latent period of sleep.Conclusion Shui'an Capsule produces obvious sedative hypnotic effect.