Abstract： Dystrophinopathy refers to a group of X-linked recessive myopathies that primarily affect skeletal and/or cardiac muscle caused by pathogenic variants in the dystrophin-encoding DMD gene, including Duchenne muscular dystrophy, Becker muscular dystrophy, and X-linked dilated cardiomyopathy. The broad and complex spectrum of pathogenic DMD variants complicates the diagnosis and clinical classification in some patients. The precise genetic diagnosis is of great significance for the clinical diagnosis and treatment, multidisciplinary management, genetic counseling, prenatal diagnosis, and selection of gene therapy in dystrophinopathy. The present guideline is primarily based on the research advances in dystrophinopathy. Meanwhile, the foreign and domestic clinical guidelines or consensus for dystrophinopathy were referenced to put forward 18 recommendations and reach a consensus on the clinical manifestations, genetic basis, clinical diagnosis and classification, genetic diagnosis, and clinical genetic counseling of dystrophinopathy. This guideline aims to standardize and optimize the diagnostic process and reduce the diagnostic difficulty of patients with dystrophinopathy. In addition, this guideline provides some practical reference for clinicians and government staff.