The arm scraping is carried out from top to bottom. First of all, we should report the loss of the three Yang meridians of the hand on the outside of the arm: the large intestine meridian of the hand Yangming, the small intestine meridian of the hand Taiyang, and the triple energizer meridian of the hand Shaoyang. You can click on local key points. Then scrape the three yin meridians of the hand on the inner side of the arm: the lung meridian of the hand Taiyin, the pericardium meridian of the hand Jueyin and the heart meridian of the hand Shaoyin. The strength is from light to heavy, and the scraping boards in key parts should sink to avoid scratching the skin.