There have been many studies on treatment methods and phonetic support to help children with cleft lip - palate have more opportunities to integrate into everyday life. However, studies on the effectiveness of sound correction games for children with cleft lip - palate after surgery have yet to be conducted. In this article, we experimented with a sound correction game for children aged 3-6 after cleft lip and palate surgery. The experimental results showed that after surgery, children with cleft lip and palate could correct most of the errors they made. Depending on each case and the degree of deformity, the ability to progress will vary over time and usually fluctuate from 22 to 24 months with an intervention frequency of 2-3 sessions/week. The experimental results also clearly show that the sound correction process for children with cleft lip and palate after surgery at school age will help them have more opportunities to achieve their expectations in daily life and study.