Abstract: Taking 3Red Fuji Bud variations and 2Red Fuji varieties as test materials,the comparative analysis method was used to observe the biological characteristics such as phenology and fruit setting rate of different short-branched Red Fuji bud variations,and to measure the single fruit weight,soluble sugar and vitamin C content.The biological characteristics and fruit quality similarities and differences of Red Fuji bud change were studied,the comprehensive traits of bud change were evaluated,in order to provide reference for the selection and breeding of good bud changes.The results showed that the phenological periods of the three bud changes were relatively consistent with those of‘Nagafu No.2’and‘Xinhong No.1’in terms of flowering,branches,leaves and fruit setting.The growth period was180-190days,and the vegetative growth period was 210-220days.The inflorescence and flower fruit setting rates of bud‘N-1’were 82.94% and 58.15% respectively,26.76% and 40.90% higher than‘Nagafu No.2’;the soluble solids,soluble sugar,reducing sugar sugar-acid ratio of‘N-1’were significantly higher than ‘Nagafu No.2’,and the vitamin C content of ‘N-1’ was2.79mg·（100g）-1,which was higher than ‘Nagafu No.2’,but lower than ‘Xinhong No.1’.In summary,‘N-1’had the characteristics of high fruit setting rate,high yield and bright fruit color,and was a bud variant with better comprehensive traits.