Speech therapy time and method The speech therapist makes a more accurate diagnosis of the nasal/palatal sounds and functional speech sounds by observing, examining and comparing the cleft palate patient. The speech therapist analyzes the voice timbre, phonemes, the degree of excessive nasal and low nasal sounds, poor speech habits such as lip and tongue habits, and facial expressions during speech sounds to make an overall assessment of the postoperative speech status and speech development of the cleft lip and palate patient. After the evaluation, the corresponding speech therapy will be carried out. 1.Time of speech therapy The fastest stage of speech development in children is from 0 to 3 years old. From the age point of view, the minimum age for speech training should be when the patient can basically understand and accept adult instructions and give cooperation and imitation, generally at the age of 3 to 4 years old, or postponed to the age of 5 to 6 years old if the patient is not cooperative . At the 3rd International Speech Medicine Research Conference, authorities from cleft lip research centers in more than 30 countries concluded that the best age to receive speech therapy is around 4 years old, and the average duration of speech therapy is 6 to 12 months, and for some severe speech disorders, the duration of therapy can be up to 2 years or more. The timing of speech therapy after surgery used to suggest that speech training could be started 1 month after surgery, but in recent years it is considered appropriate to wait until perception is restored and the scar begins to soften before speech training. It can be chosen 2 months to 3 months after the operation, and strengthen the functional exercise of the soft palate before the training itself. 2.Language training method Speech therapist will conduct treatment once or twice a week for 45-60 minutes each time, starting from Chinese pronunciation, correcting bad pronunciation habits and training the articulatory organs and muscles. Patients need to take the initiative to practice normal pronunciation at home, and the family cooperation time should be at least 40 minutes to 60 minutes per day, with appropriate adjustment according to the patient’s age and acceptance ability. Regular review and participation in speech training classes. The practice of articulation organs is mainly lip and tongue practice. With the help of standard dental model, demonstration, pointing and imitation, patients can understand the relationship between lip, tongue, palate and teeth when pronouncing bilabial, labiodental, lingual anterior, lingual posterior and lingual root sounds, and practice repeatedly.