Abstract:This study selected Choerospondias axillaris leaves from eight developmental stages as experimental materials.Polysaccharides were extracted by an ultrasound-assisted method，and their dynamic changes across growth stages were investigated through polysaccharide content determination，monosaccharide composition analysis，and antioxidant activity evaluation.The results demonstrated that total polysaccharide content in Choerospondias axillaris leaves from 22.41%to 34.16%，exhibiting an overall decreasing-then-increasing trend during ontogeny，whereas uronic acid content showed no significant variation among different stages（P＞0.05）.Monosaccharide composition was dominated by mannose，rhamnose，glucose，galactose，and xylose，with glucose presenting the highest relative molar ratio and most pronounced content fluctuation；the content of mannose and xylose remained relatively stable. Antioxidant analyses revealed that polysaccharides from t1（germination stage）and t8（senescence stage）exhibited relatively strong antioxidant activity.