To analyze professor Tang Qisheng′s experience in the treatment of geriatric depressive disorder. Methods:Cases of totally 51 patients and 160 visits,from the clinic of Pro. Tang in 3rd hospital affiliated to Beijing University of Chinese Medicine from Dec 2013 to Jun 2014,were collected. Database was established and the net model was set up between frequently used drugs to analyze Tang′s medication rules. Results:1) Basic formulation for geriatric depressive disorder was summarized. 2) The partnership rules of frequently used drugs were summarized. Conclusion:Association rules can be used to summarize the experience of famous physicians in Chinese Medicine.