The purpose of this study is to evaluate the effectiveness of computer assisted pronunciation instruction in English pronunciation for students in vocational colleges and universities in Taiwan. The participants were fifty-one first-year undergraduate students from a technological university located in central Taiwan. The participants received an eight-week pronunciation instruction, in which the participants were presented model utterances and corresponding pitch contours of target sentences and then practiced pronunciation of target sentences with computer assisted pronunciation training software. Computerized speaking tests were conducted before, during, and after the training to measure the improvement of pronunciation quality, and a questionnaire was administered at the end of the instruction. The results of repeated measures analysis of variance on the scores of the tests indicate that the pronunciation quality of the participants was significantly improved. The results of this study provide empirical evidence in teaching pronunciation to vocational college students with computer technology.