Low back myofasciitis, also known as low back myofascial pain syndrome, is a chronic painful condition characterized by chronic pain in connective tissues such as muscles, tendons, and fascia, and is often characterized by highly restricted, irritable, and sensitive pressure points in the skeletal muscle fibers. Currently, the treatment of low back myofasciitis can effectively relieve pain and shorten the course of the disease by targeting the painful points. In recent years, our department has used minimally invasive release of painful points with blood release and decompression to treat lumbodorsal myofasciitis, and the results are reported below. Diagnostic criteria: The criteria for back myofascial pain in the Diagnostic Efficacy Criteria of Chinese Medicine are as follows: there is often a history of external wind and cold or exertion; the pain in the low back is spontaneous localized soreness, dull pain or severe pain; there is obvious localized pressure pain and diffuse pain at the same time; the pain is related to weather changes, and exertion or rainy days often make the pain worse; the muscles in the back are stiff and board, with a feeling of heaviness, and when touched there are hard knots and There was stiffness and heaviness in the back muscles, and a sense of hard knots and cords when touched; mobility of the low back was limited to varying degrees; imaging and laboratory tests were not abnormal. Inclusion criteria: meet the above diagnostic criteria of low back fasciitis 2; age 30-50 years; understand and sign the informed consent. Exclusion criteria: did not meet the above diagnostic criteria and inclusion criteria; combined with acute soft tissue injury, lumbar disc herniation, compulsory spondylitis, spinal tuberculosis, tumor, vertebral fracture, vertebral slippage, lumbar spine surgery patients, pregnant women, etc. General data: The observed cases were outpatients and inpatients of our department, a total of 34 cases, 19 males and 15 females, aged 30 to 50 years, with a disease duration of 1 month to 2 years. The patients were then divided into 2 groups. Treatment method: The observation group used painful point needle knife minimally invasive relaxation with bloodletting therapy, the patients were placed in prone position, and the nodes, strips, hard lumps, sensitive pressure pain points of subcutaneous fascia were searched for with thumb pressure in the lumbar back area, routinely disinfected, after local anesthesia, the needle knife incision line was parallel to the transverse skin line perpendicularly and quickly passed through the skin, sparing in the fascial layer along the longitudinal direction, peeling laterally, parallel three-dimensional cutting 3 to 5 times, and when the needle knife had a loose feeling without When the needle knife has a sense of looseness and no obvious sense of resistance, withdraw, quickly cupping at the painful point for 2 to 3 minutes, observe no blood oozing and then remove the cupping, local skin disinfection and covered with sterile gauze. The treatment was given twice a week for two weeks. In the control group, the patient was treated with Chinese herbal medicine package in prone position, and the doctor performed tendon manipulation and painful point flicking on the back of the patient, followed by 20 minutes of local hot treatment with heated Chinese herbal medicine package. The efficacy of the treatment was evaluated at the end of the course of treatment. After 1 course of treatment, the pain index of the acupuncture group was lower than that of the manipulation group, and the total effective rate of the acupuncture group was 92.33%, while the total effective rate of the manipulation group was 72.00%. The combination of wind, cold, dampness and heat is the mechanism for the formation of myofasciitis of the lumbar back. The evil mostly stays on the muscle surface, blocking the meridians and collaterals, blocking the flow of qi and blood, depriving the tendons and flesh of nourishment, and causing pain if they do not pass through, which results in muscle distension, stiffness and heaviness. Combined with modern medical research, the painful points of lumbar and dorsal myofasciitis are palpable tension strips on the lumbar and dorsal muscles and fascia due to poor posture, fatigue, cold, etc., which produce pain, muscle tension, and tugging pain when compressed. Local muscle fascia long-term tension, tissue pressure, poor blood circulation, resulting in tissue ischemia and hypoxia, increased production of inflammatory mediators and slow metabolic elimination, peripheral nerve compression and inflammatory substances stimulation and nociceptive sensitivity. Acupuncture treatment can reduce the local tissue tension at the painful point, lower the intra-tissue pressure and release the peripheral nerve compression, and cupping can make the local inflammatory substances discharged with blood to reduce the inflammatory stimulation of nerves, thus achieving the purpose of pain relief. The combination of minimally invasive acupuncture and cupping with bloodletting therapy can achieve both the primary and secondary treatment, which is safe without side effects, easy to operate and promote, and improves the clinical efficacy of treating lumbodorsal myofasciitis.