Back scraping has the benefit of improving local related diseases, dredging meridians. ⒈ improve related diseases: back Gua Sha for long-term patients suffering from frozen shoulder, chronic cervical spondylosis, lumbar muscle strain and other bone and joint muscle pain disease has auxiliary therapeutic effect, can relieve the symptoms of pain, improve the overall situation, regulate the local function. 2. dredge meridians: back scraping can play the role of dredging meridians live, improve local blood circulation, regulate muscle diastole and contraction, so that the pressure of local tissues to improve, can increase the back scraping surface tissues of the blood flow, can activate the blood to remove blood stasis (to promote blood flow, eliminate blood stasis in the body), dispel blood stasis to produce new (to remove blood stasis and promote the operation of fresh blood). Back scraping although there are benefits, but not everyone is suitable, suffering from heart, kidney, liver disease patients, limb swelling people, leukemia, thrombocytopenic purpura, hemophilia, acute osteomyelitis, infectious skin disease patients prohibit scraping.