Taking 15 seedless watermelon cultivars that inroduced in Ningxia as materials,the botanical characters and fruit traits were comprehensively compared,in order to identify new seedless watermelon cultivars which are suitable for open cultivation in Ningxia.The results showed that 9 seedless watermelon cultivars were suitable in Ningxia.They were ‘Xuefengheiniu’,‘Zhognong seedless No.2’,‘Jinmi No.8’,‘Longfa seedless’,‘Heibaogong’,‘Zhengkang seedless No.1’,‘Zhengkang seedless No.10’,‘Huangmeigui seedless’ and ‘Lvye seedless’.