The study aimed to investigate the effect of plyometric exercises using a mini-trampoline on the results of the vertical jump tests with primer - the vertical jump with a primer using the hands - the wide jump of stability - balance (CMJ-FCMJ-SLJ-TAKEI BALANCE), in addition to knowing the differences between the pre and post measurements of performance Students in motor abilities after applying the plyometric exercises for the experimental group. To achieve this, a study was conducted on a sample of 32 children, 16 children as an experimental group and 16 others as a control group, and their ages ranged between 6-7 years. All the children participating in the study performed the following tests: jump tests (CMJ-FCMJ-SLJ) and balance test ( TAKEI BALANCE) twice to verify the reliability of the tests and then apply the study methodology. The plyometric exercises were applied for a period of 18 days, and one of the most important findings of the study is that the plyometric exercises contributed significantly to the development of motor abilities (the broad jump from stability, the vertical jump with a primer, the vertical jump with the introduction of hands, the balance test) among the study sample members They were exposed to these exercises, as the effect size values ??were high depending on Cohen's classification (Cohen, 1988), and the study also showed that there are differences between the pre and post applications of the experimental group in favor of post measurement as the effect size in all jump skills was high except for the balance skill was Average.