Abstract: 【Objective】To study the effects of different exposed scape lengths of onion scape on their yield,nutritional quality, and antioxidant activity,then provide reference for the edible and development of onion scape.【Methods】Onion scape variety 911 was used as the experimental material,and field planting was adopted. Based on the length of onion scape exposure,onion scape were selected at distances of 0,5,10,20,and 30 cm from the leaf outlet for sampling. The effects of different exposed scape lengths on onion scape length,scape diameter,fresh weight per scape,yield,and dry matter,soluble solids,soluble sugar,soluble protein,pyruvic acid,total phenolic,total flavonoid content,as well as FRAP free radical scavenging rate,DPPH free radical scavenging rate,ABTS free radical scavenging rate were analyzed.【Results】With the growth of onion scape,the linear regression equation for scape length was y=1.096 4x+22.751 0,R²=0.987 7;the linear regression equation for scape diameter was y=0.135 5x+5.310 9,R²=0.985 5;the linear regression equation for fresh weight per scape was y=0.844 4x+4.017 1,R²=0.993 8;the yield was 2 813.850~11 544.000 kg/hm². The dry matter content ranges from 10.590% to 12.040%,the soluble solids content ranges from 9.740% to 14.330%,the soluble sugar content ranges from 69.530 to 89.160 mg/g,the soluble protein content ranges from 0.870 to 1.170 mg/g,the pyruvic acid content ranges from 0.065 to 0.089 mg/g,the total phenolic content ranges from 3.200 to 4.770 mg/g,and the total flavonoid content ranges from 0.344 to 0.557 mg/g. Compared with a scape length of 0 cm,when the scape length was 20 cm,the dry matter,soluble solids,and pyruvic acid content increase significantly by 7.930%,13.150% and 33.850%,respectively （P<0.05）;The soluble protein content increased by 3.260%;The content of soluble sugar and total phenols significantly decreased by 15.250% and 24.530%,respectively（P<0.05）. The FRAP free radical scavenging rate,DPPH free radical scavenging rate,and ABTS free radical scavenging rate showed a decreasing trend from 0 to 20 cm,with the lowest values observed at 20 cm.【Conclusion】The shorter the onion scape,the larger the average membership function,and the better the comprehensive nutritional quality and antioxidant capacity. However,considering the yield,edibility,nutrient content,and antioxidant activity of onion scape,the most suitable harvesting period is when the onion scape are 20 cm long,and the yield can reach 11 544.000 kg/hm².

Key words: Onion scape, Yield, Nutritional quality, Antioxidant activity