Objective: Grey relational analysis(GRA) and fuzzy clustering analysis(FCA) are adopted to discuss the regularity of compound herbal formulae for OP.Method:A retrieval of China Knowledge Infrastructure(CNK) was undertaken to identify the 104 articles of compound herbal formulae for OP which were published from January 1995 to December 2005.Collecting and discussing each herbal name and dosage under EXCEL2000.The herbs which were used more than 10 times were discussed by GRA under EXCEL2000 and clustered by ...