Atractylodes macrocephala is a warm and dry medicine, which is liked by the spleen and can meet the needs of the spleen under pathological conditions. It can not only invigorate qi and spleen, improve some pathological conditions of spleen deficiency, but also effectively eliminate the stagnation of dampness and turbidity and internal resistance of dampness and evil caused by spleen deficiency. It is a single medicine that can both tonify deficiency and dispel evil.
白术，是一个温燥的药，它为脾所喜，能够满足脾在病理状况下的需要，既能够补气健脾，改善脾气虚的一些病理状况，也能够有效地消除脾虚而伴有的湿浊内停，湿邪内阻的情况，它是既能够补虚，又能够祛邪的一味药。
来源：黄帝内经
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