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Objective: The purpose of this research was to examine the training effects of the various Vocal Function Exercise (VFE) programs, and to examine factors which influence their therapeutic effects.Method: First, 18 patients with dysphonia were randomly classified into two groupsgroup A demonstrating nasalized vowel prolongations before producing pitch glides, and group B presenting pitch glides before producing nasalized vowel prolongations -and training was begun. Then, we examined 11 of the subjects who were able to complete the treatment. Comparison was performed by analysis of variance (ANOVA) using the following dependent variables: phonatory function parameters, acoustic parameters and subjective evaluation.Results and Conclusion: After training in nasalized vowel prolongations by VFE intensively in isolation for two weeks, maximum phonation time (MPT) appeared to have direct influence.