The center stroke means keeping the pen upright, with the tip in the middle, and not deviating from the left or right. This is called "center". The center stroke is to let the tip of the pen move in pointillism. This method of handling the pen is the main method of using the pen. Chongguang of the Qing Dynasty said in "Green Raft": "If you can use the center, even if you fail, your writing will be good; if you can't use the center, even if you are good at it, you will be poor. The root of good or bad lies here." It is true that the center is the main point in calligraphy. According to the law, so far, the center-point pen is still the most popular in calligraphy. Due to the change of moving the pen up and down, pressing and moving the pen in the center, different shapes of stipples will appear, showing the interest of hardness, softness, curvature, and vertical and horizontal movement. If there is a tube on the side of the wrist, it will hinder the center of gravity of the middle hair and make it straight. According to the experience of the predecessors, if the wrist is straight, the front is straight, and if the front is straight, the front can be extended, tightened, spread, pressed, and lifted. Only the forward can keep the center forward. In short, center is a key to using the pen. Only by being upright can one's bones and blood be abundant and his spirit soar. Of course, calligraphy strokes are extremely varied, and it is impossible to reach the center of each stroke. However, no matter how the changes are made, the center will be reached at the end of the stroke, which must attract the attention of beginners.