Let’s take the most common clinical problem as an example. We all have this experience and understanding, little babies are just born can not speak, as they grow older, slowly he will say words, then words, simple sentences, and finally complex sentences, and they know more and more vocabulary, in this process, some children began to speak unclear, and then speak clearly; some children began to speak early, and some children began to speak However, regardless of the time, these children are usually able to speak clearly before they start school. In fact, this process is the development of phonology. Phonological development is the same as the growth and development of children, and it requires a process. Generally speaking, 2-5 years old is a period of rapid language development for children. During this process of phonological learning and development, all children do not have smooth sailing, and about 15% (Taiwan’s morbidity statistics) of children make one or another errors that sound “slurred” to others, such as saying “brother” as “d”. (dede)”, “rabbit” as “kuzi”, “apple” as “bingguo “and so on. Some of these errors are age-related, as many parents say: “It’s okay when you grow up,” while others need to be corrected with the help of a speech therapist. About 5% of children with “slurred speech” will grow out of it, while the remaining 10% will need help to improve. We usually refer to this type of slurred speech as a dysarthria, which refers to problems with the control and coordination of the speech organs and airflow in the process of speech production, resulting in incorrect speech. There are usually no anatomical abnormalities in diction.