To summarize Professor Tian Jinzhou's medication rules in the treatment of early dementia and to elucidate the idea and experience of Professor Tian Jinzhou in the diagnosis and treatment of early dementia.Methods:Based on the data analysis system of medical records，the first medical records in the treatment of early dementia of Professor Tian Jinzhou，a national famous old doctor of Chinese medicine，were collected，and the prescriptions were screened to analyze the medication rules.Results:A total of 107 prescriptions for the treatment of early dementia were screened out by applying the traditional Chinese medicine inheritance support system(TCMISS).The four natures and fove flavors，channel tropism，frequency of drugs，commonly used drug combination and drug pairs in these prescriptions were determined，and 11 new prescriptions were obtained by evolution.Conclusion:Professor Tian Jinzhou mainly treated early dementia with drugs for tonifying kidney and nourishing liver，strengthening spleen and resolving phlegm，calming the liver and clearing fire，nourishing blood and tranquillization，which provided the basis for the clinical treatment of early dementia with traditional Chinese medicine.