Objective: Using traditional Chinese medicine inheritance system(TCMIS) to analyze the inherent relationships between herbs in prescriptions of prevention and breatment for influenza. Method: The prescriptions used for prevention and treatment for flu in China National knowledge Infrastructure(CNKI) were collected

then by using revised mutual information and complex system entropy cluster in the TCM inheritance system

inherent relationships between herbs in prescriptions were analized. Result: Based on the analysis of 341 cases of prescriptions in database

the frequency of each herb included in the database is computed

core combinations of herbs and relationship framework between herbs are mined from the database. Conclusion: TCM inheritance system can be used to analyze the prescriptions database and transfer complicated inherent relationships between herbs in prescriptions orderly. So it can provide powerful reference to researcheres for making decision.It has good value for the research of traditional Chinese medicine.