Submucous cleft palate (SMCP) is a subgroup of cleft palate which is often unawared by general practitioners. The diagnostic triad of (1) bifid uvula, (2) translucent zone in soft palate and (3) bony notch in the posterior edge of the hard palate can be variable in their severity among each patient. Some patients with SMCP will have speech problems with velopharyngeal insufficiency (VPI) and/or articulation errors. Patients will also have middle ear effusion as in an overt cleft palate. Surgical treatment is indicated in the presence of VPI or recurrent otitis media. There are controversies on the timing and type of surgical intervention. This study was the first part of an ongoing study on SMCP. It was a retrospective review of the SMCP patients treated before June 1988 to compare the results among different age groups and surgical procedures. It was found that neither age nor type of surgery was a determinant for a satisfactory correction of VPI. Unless the patient had recurrent otitis media, surgery should not be performed before having a thorough speech evaluation including perceptual assessment and instrumental assessment. The type of surgery should be decided according to the findings from the instrumental assessment.