八方线图由武术方向方位的四正位（东、西、南、北）、四偶位（东北、西北、东南、西南）以及前进、后腿、左顾、右盼、中定等八门五步十三势组成，运用几何原理，以外接圆从正方变化为圆形八方线图。太极拳十分重视方向方位及中正安舒。有了八方线，在练拳时，就有一个准确的中心点，方向方位准确无误，避免脚下出现"差之毫厘，谬以千里"的错误。

Eight-direction Line Diagram is formed by The Thirteen Postures, including eight directions, four normal directions of martial arts: east, west, south, north, and four corners directions: northeast, northwest, southeast, southwest, combining with five steps: advancing, retreating, look to the left, look to the right, central equilibrium, The circular Eight-direction Line Diagram is from a square, forming from the rim of a circle through geometry principle.