This is an action research project conducted in a speaking course for first-year English majors at Hong Duc university. Realizing that freshmen' poor pronunciation hindered their performance in speaking classes, the teacher/researcher designed a new teaching program to supplement the current syllabus with the hope to improve their English pronunciation. The program involved using computer software to provide students with explicit instructions on English sounds, word stress, sentence stress, and intonation. The data were obtained from audio recording, classroom observation, and informal interview with students. The findings show that the intervention helps improve English pronunciation for first-year English majors at Hong Duc university.