Purpose: This study aimed to examine the kinetics characteristic of single- and double-legged drop jump during push off phase. Methods: Twelve college physically activity men was asked to perform the single-legged drop jump from height of 10 cm (SDJ_10), and double-legged drop jumps from heights of 20- and 40-cm (DD_J20 and DDJ_40). A high speed camera and one force plate were synchronized to collect the data. The inverse dynamics process was used to calculate the net muscle joint moment and power. One-way ANOVA was used to test for differences in dependent variables among three drop jump tasks. The significance level was set at α = 0.05. Results: The SDJ_10 had a significantly greater vertical ground reaction force and a larger peak ankle extension moment and peak knee extension moment then the DDJ_20 and DDJ_40. The SDJ_10 produced a significantly greater peak ankle concentric power and significantly smaller peak hip concentric power then the DDJ_20 and DDJ_40. Conclusion: There are significant differences between the push off phase kinetics of the single- and double-legged drop jumps. We infer that the plyometric training on single- and double-legged drop jumps, muscle strength and explosive training efficiency should be different.