Abstract: ‘Qing’ai 1’is a new apple dwarfing rootstock hybrid cultivar，which crossed by‘M2’and‘M9’. Its crown is small and the length of the internodium is 1.6 cm. The grafting survival rate on the rootstock is 84.0%，while the grafting survival rate on the cultivar is 87.8%. The survival rate of the 3-years-old nursery stock grafing on the interstock is 73.8%. The Fuji tree in high-yield year dwarfing on the interstock has a 2.93 m height and a 3.10 m crown diameter，and its grafting union is not swelling，without air root. The ratio of the trunk circumference of the cultivar /inter stock is 0.95. 61.5% of the Fuji grafting on the interstock begin to produce at 2 years old. The average yield of the tree of 7–14 years old is 43 380 kg · hm-2. The soluble solids content of the Fuji grating on the interstock is 14.9%，the hardness is 8.3 kg · cm-2，and the fruit index is 0.86，which is suitable for the application in the main dwarfing apple production area such as Shandong，Hebei，Shanxi and Shaanxi.

Key words: apple, rootstock, cultivar