Objective To investigate the value of ultrasound in assessing the impact of preoperative use of an orthopedic plate(OP) in improving pronunciation of children with cleft palate. Method Ultrasound was performed in 36 surgery treated children with cleft palate. To facilitate the visual presentation of data we observed, we formulated a recording method in which probe was set as point O, the intersection point of incident direction in tongue back?as point A and the peak of?tongue back?as point B. Values of AO and AOB were used to state the height of tongue back and the change of peak of tongue back. Among the 36 children patients who received surgery, 18 used orthopedic plate, while the other 18 not used. AO value and AOB value of both of them were recorded and compared with healthy children. Simultaneously, speech outcome of the two groups of patients were evaluated pre and post operation. Result Before surgery, AO value of children patients was significantly lower than healthy children, and AOB value was obviously higher than the healthy children, indicating that ultrasonographic assessment showed tendency of tongue back down and tongue body contraction of children with cleft palate . After the operation, AO value was upregulated, AOB value was decreased compared with pre-operation values, and the difference was statistically significant (all P<0.05), evidenced that ultrasonographic assessment showed the surgery achieved its goal of improving?tongue back elevation and the tongue body protraction; Preoperative use of OP group’s AO and AOB value data compared with unused OP standard deviation was small, discrete degree was low, the data showed that the orthopedic plate can effectively prevent the irregular movement of the tongue;At the same time preoperative use of OP group had a significantly higher percentage of good pronunciation than never use OP group, It was indicated that the ultrasonic evaluation of OP was consistent with the speech test. Conclusion Ultrasound can be used as an effective method to evaluate the early continuous use of OP to inhibit the irregular movement of the tongue and improve the postoperative pronunciation.