The invention relates to an effective part of a traditional Chinese medicine, and particularly belongs to an effective part for treating spleen-deficiency type constipation by using rhizoma atractylodis. The effective part adopts a rhizoma atractylodis sugar compound as a main active component. The effective part can be prepared into various oral preparations including tablets, oral liquids, granules and capsules and the like by assistance of pharmaceutically-common auxiliary materials. Shown by pharmacological experiment results, the effective part has the advantages of action for treating the spleen-deficiency type constipation and obvious effect.