Abstract: 【Objective】 This project aims to explore the growth performance and adaptability of new apple variety Ruiyang in Ili Valley in order to provide theoretical basis for reasonable planning and layout of apple varieties in that area. 【Methods】 Regional cultivation experiment for the introduced new apple variety Ruiyang,the main tested variety is Ruiyang,the control varieties are Ruixue and Yimei. Phenological period,botanical characters,affinity and seed setting of different rootstock-spike combinations were investigated in the field. Taking one-year-old dormant branches as testing materials,the electrolyte permeability of branches of three apple varieties such as Ruiyang under different low temperature treatments was measured by conductivity method,and the low temperature semi-lethal temperature of Ruiyang branches was calculated by Logistic equation. 【Results】 Studies have shown that the tree posture of Ruiyang apple was moderate,and the tree posture was relatively open in Ili. The annual branch color was red-brown,with an average length of 47.62 cm,internode length of 3.02 cm,and branch diameter of 4.82 mm;The average length of leaves was 8.07 cm,the width was 4.64 cm;The color of leaves was thick green,with complex sawtooth;Flower buds was conical,4-6 flowers per inflorescence,corolla size averaged 4.23 cm. The germination period of Ruiyang was concentrated in the end of March to early April,the flowering period was in the middle and late April,the flowering duration was 9-11 days,and the deciduous period was in the end of November to early December. Fruit development was 174 days,shorter than Fuji 11 days,vegetative growth 246 days,fruit got ripe in mid-October. Through field investigation,the grafting mouth of Malus sieversii/KM23/Ruiyang rootstock-scion combination seedlings generally healed well,the seedlings grew normally with strong disease resistance,and some plants had strong flowering ability. Combined with the classification of freezing injury after low temperature treatment,the semi-lethal temperature(LT₅₀ ) of Ruiyang was determined to be -30.2℃. 【Conclusion】 Ruiyang can adapt to the local climate environment since introduced into the Ili Valley with the characteristics of high quality,good color appearance,strong resistance and adaptability. It is a mid-late maturing apple variety with excellent comprehensive properties. It is suitable for planting in the temperature inversion region of 800 m-1,200 m along the mountain on the sunny slope of Ili. The Malus sieversii/KM23/Ruiyang was preliminarily selected as the rootstock-spike combination suitable for cultivation in Ili.