Hypertension impacts the quantity of free radicals within the body. This study aimed to investigate the effect of antihypertension based on free radical levels in the predni-sone-induced rats, focusing on evaluating specific anti-hypertensive fraction of avoca-do leaves. The study's methods conducting GC-MS, anti-hypertensive, and assessing malondialdehyde levels and catalase enzyme. Systolic blood pressure measurements indicated that the positive control (131 ± 3 mmHg) and ethyl acetate fraction (136 ± 4 mmHg) were statistically similar, significantly different from the negative control group. Diastolic blood pressure measurements showed a blood pressure decreasing in posi-tive control (105 ± 7) that similar statistically with ethyl acetate fraction (104 ± 6), and significantly difference with negative control group. Malondialdehyde levels were nota-bly elevated in both the positive control (37.79 ± 5.47) and ethyl acetate fraction (38.01 ± 5.47) compared to the negative control (-9.07 ± 10.10), indicating increased free rad-ical. Catalase activity demonstrated significant differences, with the positive control (44.06 ± 5.44) and ethyl acetate fraction (44.05 ± 5.45) showing similar levels, both substantially higher than the negative control (13.90 ± 21.50). In summary, this study indentificates several flavonoid compounds that promising anti-hypertension effect from ethyl acetate fraction of avocado leaves extract.