This article is to affirm the connotation of confession in Yung-Cha Hsuan-Chueh's Chan practice based on the content of Buddhist extinguishing one's sin by confession in Yung-Cha’s Words and Truth Testimony and in contrast to the implementing confession thought of Da Mo, Hui Neng, Sheng Hsiu, Sheng Hui, etc. With the awareness, comprehension and analysis of relevant information, the author has interpreted it by means of three chapters—"Relationship Between Yung-Cha's Chan Practice and Confession", "Connotation of Confession for Pure Practice", "Mercy Vow Power in Vow Text", and Chapter 2 is divided into three points—"Focus on Law While Neglect Body", "Purify One's Remarks", "Get Rid of Major Obstacle by Deep and Pure Mind" for detailing its confession thought. This article is to affirm the connotation of confession in Yung-Cha Hsuan-Chueh's Chan practice based on the content of Buddhist extinguishing one's sin by confession in Yung-Cha's Words and Truth Testimony and in contrast to the implementing confession thought of Da Mo, Hui Neng, Sheng Hsiu, Sheng Hui, etc. With the awareness, comprehension and analysis of relevant information, the author has interpreted it by means of three chapters—"Relationship Between Yung-Cha's Chan Practice and Confession", "Connotation of Confession for Pure Practice", "Mercy Vow Power in Vow Text", and Chapter 2 is divided into three points—"Focus on Law While Neglect Body", "Purify One’s Remarks", "Get Rid of Major Obstacle by Deep and Pure Mind" for detailing its confession thought.