Cleft lip and palate is a common congenital developmental malformation of the oral and maxillofacial region. The child has a cleft lip and palate, and the oral and nasal cavities are connected, resulting in severe impairment of oral functions such as speech and swallowing. With the continuous improvement of living standard, especially with the assistance of international charity organizations “Smile Train” and “Operation Rebirth” in Hong Kong, most children in China are now able to receive basic first-stage surgical treatment, but some of them still have poor pronunciation after surgery. Long-term abnormal pronunciation will directly affect the children’s life, study and later employment, socialization 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 parents, but also the concern of the society today. A complete palatopharyngeal closure separates the oropharyngeal cavity from the nasopharyngeal cavity and creates sufficient pressure in the oral cavity to produce clear speech. In cleft palate patients, due to the defective palate, the airflow enters the nasal cavity during articulation and the pressure in the oral cavity is insufficient, resulting in a decrease in speech intelligibility. 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 he is “scolding” and “aunt” as if he is “scolding”. These mispronunciations caused the children to pronounce “dad” as “scolding”, “aunt” as “oooo”, and “rice” as “nano”. ……, etc. If we are not close to someone, we will not understand the meaning of these words and will not be able to 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 simply close the cleft, but the soft palate must be of sufficient length and the position of the palate muscles must be restored to normal, which is the key to restoring 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. In other words, 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, which is generally considered to be around 2 years of age. 2 years of age is a period of rapid phonological development, and successful surgery helps the child to develop a normal articulatory site and articulation method and reduces the production of alternative sounds. The purpose of post-surgical speech training is to coordinate the muscular movements of the oral cavity and palatopharynx, to learn to use the correct articulatory parts and articulation methods, and to prevent the development of pathological speech. The training is usually done one month after the cleft palate surgery, when the palate is well healed and the child has recovered. The training is best done with the help or guidance of a speech therapy professional. At present, there are no full-time speech therapists in mainland China, but mainly oral and maxillofacial surgeons, with the assistance of parents. Therefore, it is important for parents to learn and apply the relevant phonological knowledge to help their children regain their phonological functions. The speech errors in cleft palate are common to all children, but the manner and degree of expression may vary depending on the environment and dialect of the child. It is important to pay attention to the rate of speech development in young patients, as children with cleft palate generally develop later than normal children. It is also important to distinguish speech abnormalities from those caused by short lingual tethering and cerebral hypoplasia. Patients who are unable to regain normal speech through speech training may undergo secondary surgery. 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 sequence of treatment is required to address other problems associated with cleft palate, such as malocclusion, hearing impairment, and psychological disorders, in order to achieve satisfactory results.