To observe the clinical effects of nourishing water and reducing fire method to treat insomnia. Methods: A total of 50 patients were randomly divided into the treatment group(25 cases) and control group (25 cases). Patients in the treatment group were treated by nourishing water and reducing fire method plus western medicine, and those in the control group were treated only by western medicine. After three months of treatment, to observe the clinical efficacy and AIS score changes of the two groups. Results: AIS score after treatment significantly reduced in both of the groups(P<0. 01) and the treatment group was in a larger degree than the control group (P<0. 01). AIS score efficiency in the treatment group is 92% and 60.0% in the control group(P<0. 05, P<0. 01). Conclusion: It is effective to use nourishing water and reducing fire method to treat insomnia.