Objective: To analyze the prescription experience of professor LIU Chi-nian for treating chronic gastritis(CG) by using Traditional Chinese Medicine Inheritance Support System(TCMISS). Method: The prescriptions for chronic gastritis(CG) were collected

and then the data was input into the TCMISS to analyze the prescription experience of professor LIU Chi-nian by using data mining methods

such as improved mutual information

complex system entropy cluster and unsupervised hierarchical cluster. Result: Based on the analysis of 125 prescriptions

the frequency of herbs used in prescriptions and the association rules among the herbs were determined

and the frequently-used herbs

commonly-used herbs

12 core combinations and 6 new prescriptions were mined from the database. Conclusion: Professor LIU Chi-nian considered chronic gastritis(CG) mostly occurs with the weakness of the spleen and the stomach. Deficiency syndrome runs through the whole pathological process. The therapy shall focus on nourishing the stomach and spleen

supplementing Qi and nourishing yin. In addition

professor LIU Chi-nian laid emphasis on regulating the ascending and descending of Qi activity

and adopted clearing therapy and tonic therapy at the same time to regulate Qi and harmonizing the stomach. TCMISS is practical and objective to analyze the famous TCM doctor' clinical prescription experience

with great value in making a comprehensive summary of the clinical experience.