Abstract: ‘Shuangjiao’（X2003 x HH11） is medium-size watermelon cultivar with two flesh color.It is a F1 hybrid watermelon with medium growth potential and easy to set fruit.It matures 100.67 days from sowing and 35.33 days from flowering.The average single fruit weight is 5.44 kg, it is round shaped with green skin, dark green stripes and wax powder.The flesh is yellow and red, crisp, tasty and juicy with center soluble solid content 11.94% and 8.06% near rind.The yield is 1 824.5 kg per 667 m~2.This cultivar is suitable for spring greenhouse cultivation in Zhejiang and Anhui.It has been registered under non-major crop varieties by Ministry of Agriculture and Rural Affairs of the People′s Republic of China in Nov, 2020.