Abstract: In "Wuzhen Pian Wai Ji", the "ling chang yi wu" is not only a concentrated expression of his mind and nature, but also consistent with the Chan theory of mind and nature in terms, meaning and characteristics, which means emptiness and awareness. When discussing mind-nature insights separately, Wuzhen waipian（悟真外篇）is consistent with Chan Buddhism, and the various aspects of the two mind-nature theories are carried out by the integration of emptiness and non-duality, and are concentrated as emptiness and knowledge. However, there are differences in specific methods of practice. The Wuzhen waipian implies that practitioners need to understand the nature of mind and the Golden Core Path simultaneously, cultivate xing（性）and ming（命）, combine Chan and Dao, while Chan Buddhism is straight to the heart without emphasis body practice. The difference in practice methods reflects that although the views on the nature of the mind are the same, the relationship between the nature of the mind and the dharma is different, that is, whether the xinxing（心性）can fully integrate the dharma and make the two different specific practices methods.

Key words: Ling chang yi wu, Wuzhen pian, Chan Buddhism, Lingzhi