Abstract The purpose of this study was to investigate the influence of eight-week plyometric training (PT) on male junior high school students’ anaerobic capacity (AC). The subjects were fifty male students (age 14.3 ±.4 yrs) in Fu-Ying Junior High School, who were randomized into an experimental group (EG; 25 subjects) and a control group (CG; 25 subjects). The CG was not given any exercise training except school physical education (PE) curriculum. The EG accepted both mid and low-intensity PT. The tests of anaerobic capacity included: vertical jump, standing long jump, 10 m x 4 shuttle-run, 30 m dash. Mixed Design 2 way ANOVA was applied to test the difference of mean. The significant α was set at .05. After 8 weeks of PT and PE curriculum, both groups significantly improved performance in vertical jump, standing long jump, 10mx4 shuttle-run, 30m dash. Although the CG received PE activity during the training period, the training effect was not as good as PT. At the end of training period, EG was significantly superior to PT in all anaerobic variables (p<.05) except 30m dash. This study concluded that plyometric training does significantly improve male junior high school students’ AC.