To observe the effect of Jiawei Sanxiang Decoction in treating intestinal qi stagnation and spleen deficiency type of functional constipation. Methods: Eighty cases of patients with intestinal qi stagnation and spleen deficiency type of functional constipation were randomly divided into treatment group and control group, with 40 cases in each group. The treatment group was given Jiawei Sanxiang Decoction, while the control group was given orally taken polyethylene glycol 4000 powder. The duration of treatment had lasted for 14 days. Records was taken in regard to Traditional Chinese Medicine symptoms, specifically, defecation intervals, defecating time, stool characters, distending pain in the lower abdomen, chest and hypochondrium distension stuffy pain, belching, lassitude and disinclination to words, and fatigue symptom, and assessed by SAS integral. Results: There are no significant difference in curative effect on functional constipation and improvement on stool character between the two groups.(P>0.05) However, after the treatment, TCM syndrome integral and SAS integral in the treatment group were significantly lower than those of the control group, and the difference was of statistical significance (P<0.05). Conclusion: Jiawei Sanxiang Decoction can effectively treat intestinal qi stagnation and spleen deficiency type of functional constipation and can improve the TCM syndromes and relieve anxiety of patients.