Objective To analyze the prescription rules of formulas contained Danggui（当归

Radix Angelicae Sinensis） in Chinese Prescription Preparations. Methods The formulas contained Danggui（ 当归） in Chinese Prescription Preparations were searched and the database was established. The indications

pattern distribution and commonly used herbs were analyzed by frequency statistics and association rules. The impediment disease and menstrual disorders were selected as representative indications for analysis. Results Totally 883 formulas were included and 208 indications were involved. The top 25 indications（frequency≥20） were gynecological diseases

limb disorders

channel diseases and deficiency diseases. There were 166 patterns involved and 14 patterns（ frequency≥20） such as qi-blood stasis pattern and qi-blood deficiency pattern were commonly seen. Totally 949 herbs were involved and Danggui（ 当归） was commonly combined with Chuanxiong（ 川芎

Rhizoma Chuanxiong）

Baishao（ 白芍

Radix Paeoniae Alba）

Fuling（ 茯苓

Poria） and Baizhu（ 白术

Rhizoma Atractylodis Macrocephalae）. Danggui（当归） was commonly combined with wind-damp-dispelling and channel-network vessels-freeing herbs to treat the impediment disease

while commonly combined with qi-supplementing

blood-nourishing and blood-quickening herbs to treat menstrual disorders. Conclusion The formulas contained with Danggui（ 当归） are widely used in clinic. Danggui（ 当归） is commonly combined with qi-blood supplementing herbs and different effects can be achieved as combined with different herbs. TCM inheritance auxiliary platform is an important tool for analysis on TCM prescription rules.