Objective: Based on the association rule

to find the relationship between the traditional Chinese medicine(TCM) nature and other properties. Method: Many text book were used as the information source

such as ‘Chinese pharmacopoeia’

‘Chinese materia medica’

etc. And combined with the empirical clinical medication

we builded the Chinese medicine database. Based on the improved Apriori algorithm

we analyzed the relationship between the TCM nature and other properties. Result: We have found the closely frequent itemsets in Nature-Pharmacology

Nature-Indication

Nature-Western medicine name

Nature-Function

Nature-Flavour

Nature-Channel tropism

Nature-Chemical composition

etc. And we calculated support and support rate in the TCM nature and other properties. Conclusion: Through analyzing the relationship between the TCM nature and other properties based on the association rule

the analyzability of results are reasonable which is consistent with the traditional understanding of the TCM nature.