Sun Shi-Tai Ji Chuan used many techniques of Xingyiquan and Bagua Boxing in boxing, and the boxing frame was mainly flexible in advancing and retreating in half a step, so he directly adopted Xingyiquan's three-step method as one of his basic pile methods (the other pile is a rodless pile or a round pile, that is, piling, and all kinds of Tai Ji Chuan put forward high requirements).