Dermatomyositis, myositis is a chronic inflammatory disease of the skin and muscles, manifested by skin erythema, edema, muscle pain, muscle weakness, muscle atrophy, mainly affecting the proximal transverse muscles of the extremities, can also involve multiple organs, is a systemic disease 90% of patients with abnormal electromyography. The disease can develop at any age, female prevalence, often accompanied by malignant tumors. 1.Keep your mood comfortable, treat the disease correctly and cooperate with the treatment. 2.Keep indoor air clean, pay attention to warmth and avoid getting cold. 3, pay attention to nutritional intake, mainly high protein, high vitamin, low salt, eat more fresh vegetables, fruits, avoid greasy, spicy, seafood and stimulating food and quit smoking and alcohol. Do not eat or eat less celery, yellow cauliflower mushrooms, so as not to enhance photosensitivity. 4, swallowing difficulties can enter the liquid or semi-liquid, to prevent food choking into the airway, causing aspiration pneumonia. If necessary, nasal feeding. 5, absolute bed rest during the acute period; after the symptoms are reduced, appropriate active or passive activities can be carried out, avoid strenuous exercise to prevent muscle atrophy; massage or other physical therapy should be given when there is muscle atrophy. 6. Pay attention to skin and mucous membrane protection to prevent secondary infection. Avoid all triggers, such as infection, cold stimulation, etc.; those with skin lesions, avoid sunlight exposure. 7. Pregnancy can trigger the disease or aggravate it, and those who have children should use contraception. During pregnancy, it is best to stop using immunosuppressive drugs and non-steroidal anti-inflammatory drugs. 8, self-monitoring guidance: pay attention to signs of critical illness, such as respiratory muscle, pharyngeal muscle weakness, myalgia, muscle swelling, pressure pain, motor pain, etc., breathing difficulties, chewing difficulties, pronunciation difficulties, etc. 9, dermatomyositis is prone to gastrointestinal tract, nasopharynx, prostate, female breast and other tumors, therefore, 3-6 months need to check a full set of biochemical, B ultrasound, chest X-ray, should be consulted as soon as possible once the usual discomfort 10. Follow the doctor’s prescription, pay attention to the adverse reactions of drugs, and review regularly. When the disease is active, it is better to follow up once a month to adjust the treatment plan and monitor the drug reaction. After the disease is stabilized, the blood and urine routine and liver and kidney function should be reviewed regularly at least once every 3-6 months.