Learning disabilities are also known as special developmental disorders. It refers to a type of developmentally disabled children, who are mainly delayed in speech, learning skills (including reading, pinyin, calculation, etc.), motor skills, etc., and their performance is significantly different from their actual intelligence level. However, it is not caused by severe mental retardation, defects in sensory organs, emotional disorders or lack of learning opportunities. It may be secondary or accompanied by behavioral or emotional disorders but is not a direct consequence. . Children with special developmental disabilities usually cannot receive education in ordinary schools and need special education. . It is more common in boys and mainly includes specific dyslexia, specific spelling disorders and specific calculation skills disorders. The disease has a constant course and is not characterized by remission and relapse like many other mental disorders, which seriously affects the child's learning effect.