Objective To investigate the effects of speech training on velopharyngeal insufficiency（VPI） in patients with cleft palate. Methods Classify 30 non -syndrome cleft palate patients into Group VPI who was performed levator veli palatini reconstruction surgery at Department of Cleft and Palate Surgery, West China College of Stomatology, Sichuan University and who was performed speech training for 3-6 months after surgery. These patients were diagnosed as mild VPI by speech estimation and demonstrated a velopharyngeal distance between 1 and 5 mm through photography of pharyngeal cavity. VS-99 audio frequency analyzing system was applied to measure the second （F2） and third formant（F3） frequency of vowel [i] of 30 VPI patients before and after speech training, obtained data was compared with those of 30 normal people（Group C）. Results The formant frequency of Group VPI before speech training was F2（1 958.95±431.40）Hz and F3（3 059.84±330.09）Hz. The formant frequency of Group VPI after speech training was F2（2 322.95±213.02）Hz and F3（3 293.84±215.08）Hz. The formant frequency of Group C was F2（2 430.47±223.05）Hz and F3（3 345.97±180.83）Hz. The comparison of F2 and F3 between Group C and Group VPI before speech training showed significant difference（P
