The Red Knife, also known as the Thirteen Potential Knife, is one of the famous instruments of Yang Tai Ji Chuan. It is training based on Tai Ji Chuan's methods, requirements, styles, characteristics and applications. There are not many knives in this method, but all styles can be used, which is particularly wonderful. There are thirteen characters such as chopping, chopping, poking, scratching, scraping, pulling, stabbing, sliding, chopping, winding, fanning, blocking and sliding, and eight knife methods such as chopping, stabbing, poking and pulling the wrist. Yang Tai Chidao retains the characteristics of vigorous and brave swordsmanship routines, but it also combines the characteristics of both rigidity and softness. Its movement speed is both rigid and flexible, flowing, full of movement, both rigid and flexible, the movement momentum is stretched, agile and light, and the movements are connected with each other, opening and closing freely, which is suitable for the needs of public learning and training, health and fitness, and meets the standardization requirements of competitions.