Objective:To observe the clinical efficacy of self-made Shugan Tongfu Decoction in the treatment of functional constipation due to qi stagnation. Methods120 patients with functional constipation due to qi stagnation were randomly divided into the observation group and control group, 60 cases in each group. The control group was treated with lactulose and the observation group was treated with self-made Shugan Tongfu Decoction, with a course of one month. The clinical efficacy was observed. The changes on traditional Chinese medicine (TCM) syndrome scores (including difficult in defecation, abdominal swelling pain, belching, distention and fullness in chest and hypochondrium, borborygmus and less food intake) and the interval time of defecation were compared.  Results:The total effective rates were 91.7% in the observation group and 78.3% in the control group, the clinical efficacy of the observation group was better than that of the control group (P<0.05). After treatment, except the less food intake, all the TCM syndrome scores and the interval time of defecation were reduced in both groups compared with treatment before (P<0.05). After treatment, there were statistically significant differences on all the TCM syndrome scores and the interval time of defecation between the two groups (P<0.05).  Conclusion:The self-made Shugan Tongfu Decoction shows exact efficacy in treating functional constipation due to qi stagnation, which can effectively improve the clinical symptoms of patients and is worthy of clinical promotion.