Abstract：【Objective】Ornamental crabapple is an excellent spring flowering tree species. Studying its flowering phenology characteristics, stability and change rules, and exploring its relationship with climate change are of great significance for the prediction and regulation of the flowering period of crabapple in the future.【Method】Based on the phenological observation data of 67 varieties for 8 years, the flowering date, length and stability of crabapple were divided, and the adaptability of each variety to climate change was analyzed in combination with meteorological data.【Result】(1) The stability of the initial flowering time of the crabapple variety group was high, and the fluctuation range of the initial flowering time of most varieties (68.7%) was 0-0.04. (2) The flowering life of crabapple is highly sensitive to climate, and only some varieties (18%) have a relatively stable flowering length, with a fluctuation range of 1-2. (3) Ornamental crabapple flowering requires a certain low temperature stimulation, and different varieties have different low temperature requirements for flowering. (4) When the daily maximum temperature≥25℃, daily precipitation≥5mm or daily relative humidity≥80%, the flowering period of crabapple will be shortened.【Conclusion】Low temperature before flowering can significantly affect the stability of the initial flowering period of crabapple, and maintaining a suitable climate during flowering is of great significance for prolonging the flowering period of crabapple.