Dong Haichuan’s Baguazhang footwork shares ancestry with Ming-era systems in Hebei Province, including Bajiquan. The T-step (also called T Square) is well documented in Ming General Yu Dayou’s ‘Sword Classics’, with emphasis on polearms in origin. The reversing T step describes escaping backward, then taking advantage of an arched position in counterstrike. The T method immediately turns the back and attacks the opponent with a square geometry. Treatise: the t-square step can be used for regression, but also for progression; it may retreat; can be advanced in an arc, it can be rotated forward, or it can enter at a curve; Use every possible way to discover and apply the principal.