Dialium cochinchinensis Pierre is one of ten Dialium species found in Southeast Asia, and it is only found in Vietnam. Velvet grinding produces high-quality wood and has been listed in the Vietnam Red Book for conservation. Despite the fact that it has long been used as food and medicine in folk remedies, it is still a new object in scientific research, with very little scientific data on this plant. The provision of genuine scientific evidence aids in more rationally orienting research, development, application, and conservation of this plant. The antioxidant capacity of an ethanol extract of velvet seed was investigated using the DPPH, ABTS, and PFRAP methods in this study. The extract from ground velvet seeds demonstrated strong antioxidant activity by neutralizing DPPH and ABTS* free radicals at EC50 levels of 33,60 ± 1,66µg/ml and 140 ± 7,47µg/ml, respectively. The velvet seed extract's reducing power was also demonstrated by the reduction of Fe3+ to Fe2+ in the potassium ferrocyanide complex, depending on the concentration of action.