Cleft lip and palate is a common congenital developmental malformation of the oral and maxillofacial region. Children with cleft lip and palate have severe impairment in oral functions such as speech and swallowing. With the continuous improvement of living standards, especially in recent years, the “Smile Train”, “Operation Rebirth” and other charitable organizations, most of the children in China can now receive basic first-stage surgical treatment, but after surgery, some children still have poor pronunciation. Long-term abnormal pronunciation will directly affect the children’s schooling, employment, social life and marriage, and affect their psychological health. How to treat cleft palate after surgery and what is the effect is not only the concern of many parents of children with cleft palate, but also the concern of the society today. In normal people, except for nasal consonants, the soft palate has to lift up and contact with the pharyngeal wall to form the medical term “palatopharyngeal closure”. A complete palatopharyngeal closure separates the oropharyngeal cavity from the nasopharyngeal cavity and creates enough pressure in the mouth to produce clear speech. In cleft palate patients, due to the defect of the palate, the palatopharyngeal closure is incomplete and the airflow enters the nasopharyngeal cavity during articulation. The speech of cleft palate is affected by many factors. In Mandarin Chinese, there are mainly two types of mispronunciation, nasalized and substitution, which cause the child to pronounce “dad” as if it is “scolding” and “aunt” as if it is “scolding”. These mispronunciations caused the children to pronounce “dad” as “scolding”, “aunt” as “oooo”, and “rice” as “nano”. ……, etc. Without the “translator” of someone close to the child, we would not be able to understand the meaning of the child’s words and communicate with them properly. In order for a child with cleft palate to have normal speech, he or she must have a normal articulatory organ. Surgery can close the cleft of the palate, but to obtain clear speech, it is not enough to close the cleft, but the soft palate must be long enough and the position of the palate muscles must be normalized, which is necessary to restore speech function. The degree of deformity of the cleft palate, the skill level of the surgeon and the medical conditions of the hospital play a decisive role. The success of the first surgery on the palate of the child is crucial. If the surgery does not meet these requirements, it is unlikely that clear speech will be obtained even with voice training. Another basic condition is that the child should not be too old at the time of surgery, generally considered to be around 1.5 to 2 years old. 2 years old is a period of rapid development of the child’s voice, and a successful surgery helps the child to develop normal articulation parts and methods, and reduces the production of alternative sounds. The purpose of post-surgical speech training is to coordinate the muscle movements of the patient’s oral cavity and palatopharynx, learn to use the correct articulatory parts and articulation methods, and prevent the production of pathological speech. The training is usually done one month after the cleft palate surgery, when the patient’s palate is well healed and the body has recovered. The training is best done with the help or guidance of a speech therapy professional. At present, there is no full-time speech therapist in mainland China, mainly oral and maxillofacial surgeons and nurses, while part of the work is done with the assistance of parents. Therefore, parents’ learning and application of relevant phonological knowledge will play an important role in helping the affected child to regain phonological function. Faulty speech sounds in cleft palate are common among children, but the manner and degree of expression may vary depending on their environment and dialect. It is best to develop different treatment plans for different individuals and different faulty speech sounds before speech training. It is important to pay attention to the rate of speech development in younger patients, which is generally later in children with cleft palate than in normal children. It is also important to distinguish speech abnormalities from those caused by short lingual tethering and brain dysplasia. For patients who are unable to regain normal speech through speech training, secondary surgery can be performed. Patients with poor palate conditions who cannot be reoperated can be assisted and improved by wearing a “pharyngeal obstruction device” or “speech ball”. In addition, a multidisciplinary and comprehensive sequential treatment is needed for other problems that may occur with cleft palate, such as malocclusion, hearing impairment, psychological disorders, etc., in order to obtain satisfactory results.