Abstract:The purpose of this study was to clarify the antioxidant properties of the yellow raspberry fruits at different developmental stages.The activity of antioxidant enzymes，total phenolic content and scavenging capacity of DPPH free radical were studied using the 'Orange Miracle' yellow raspberry fruits at different development stage （green fruit，white fruit，yellow fruit and yellow red fruit） as materials.During fruit development，superoxide dismutase （SOD）activity showed an upward trend，catalase （CAT）activity first increased and then decreased，and peroxidase （POD）activity showed a downward trend，the total phenol content and its ability to scavenge DPPH free radicals showed a downward trend and then an upward trend.The periods with the highest SOD activity，CAT activity，and POD activity were yellow red fruit，white fruit，and green fruit，which were 35.58，11.69，20.51 U/（g·min）FW，respectively.The period with the highest total phenol content and its ability to scavenge DPPH free radicals were all green fruits，respectively 29.30 mg/g FW and 50.37%，which were significantly higher than the other three periods.A significant positive correlation was found between total phenolic content and DPPH free radical scavenging ability.This study provided a theoretical basis for timely harvesting and development of antioxidant foods based on' Orange Miracle' yellow raspberry fruit.