[Objective] The effects of different stubble height on the growth and photosynthetic physiological characteristics of Caragana microphylla were studied, in order to provide theoretical basis for determing the most suitable stubble height of Caragana microphylla.[Methods] Taking the Caragana microphylla planted in 2003 as the research material, and setting six treatments of unflat stubble (CK), stubble height 5 cm (T₁), 10 cm (T₂), 15 cm (T₃), 20 cm (T₄) and 25 cm (T₅) in autumn, 2018, the study measured the aboveground growth and photosynthetic physiological characteristics respectively in the next growing season.[Results] The different stubble height treatments listed in order of effect on the aboveground growth indicators and photosynthetic characteristics as follows:T₃>T₁>T₂>T₄>T₅>CK. T₃ treatment, compared with the CK treatment, exhibited the largest increases in plant height, crown length and width, and new branch among all treatments, with respective increases of up to 203.44%, 278.10%, 292.59%, 385.43%. T₅ treatment only increased by 25.15%, 26.38%, 25.93% and 88.48%, respectively. A certain stubble height treatment significantly increased the net photosynthesis (P_n), transpiration rate (T_r) and water use efficiency (WUE) of Caragana microphylla. The diurnal changes of Caragana microphylla for all treatments showed photosynthesis and transpiration midday depression. The daily average value of P_n, T_r and WUE of T₃ treatment increased by 2.52, 0.37 and 1.52 times, respectively. The P_n and WUE of T₅ treatment only increased by 0.45 and 0.32 times, while that of the T_r decreased by 0.02 times.[Conclusion] In the growth season of next year after coppicing, Caragana microphylla with 15 cm stubble height has strong growth compensation and photosynthetic capacity, followed by plants with 5, 10 and 20 cm stubble, and plants with 25 cm stubble have the weakest growth compensation and photosynthetic capacity.