Objective To observe the clinical curative effect of Ziyin Runchang on functional constipation. Methods Eighty patients were randomly divided into treatment group and control group. The treatment group was treated with traditional Chinese medicine， and the control group was treated with Fu Song for 2 weeks. To evaluate the defecation frequency， the first defecation time， stool characteristics， defecation difficulty symptom score， squatting time and clinical efficacy before and after the treatment. Results The symptoms of the defecation frequency， the first defecation time， stool characteristics， defecation difficulty symptom score and squatting time were significantly improved before and after treatment each groups（P<0.05）. The cure rate， effective rate， defecation frequency， defecation time， stool traits and defecation difficulties were significantly improved in the treatment group（P<0.05）. Conclusion Ziyin Runchang method is effective in the treatment of functional constipation.