Abstract: Five seedless watermelon varieties were introduced and observed.Their major characteristics such as phenological period,field performance,quality and yield were studied.The results indicated that Zhengkang Seedless No.3,Zhengkang Seedless No.8 and Zhengkang Seedless No.10,were the superior varieties with good marketability,high quality and high yield,etc.They are suitable to be planted in Hetao region of Inner Mongolia.Zhengkang Seedless No.4 and Jintaiyang Seedless No.1 can be planted according to market in Hetao region.