Facioscapulohumeral muscular dystrophy is a type of progressive muscular dystrophy, mainly manifesting as muscle atrophy of the face, shoulders and humerus, with progression of the disease involving the lumbar and hip muscles and lower limbs, showing difficulty in walking and squatting. The disease is autosomal dominant, not X-linked inheritance, not only male but also male and female offspring can be inherited and develop the disease, the incidence of men and women are the same. Because the genes of the disease and the normal genes are randomly assigned to the next generation, according to the principle of randomness, the chance of one generation being inherited is 50%. In addition, the symptoms of this disease are more severe in most families than in the parents, and the onset of the disease is earlier, which is called genetic early presentation in genetic medicine. Therefore, families with FAM should pay attention to the changes in limb strength of the next generation at an early stage and intervene early if there is any abnormality in order to better control the disease. Early diagnosis, early intervention, early benefit.