Abstract: 【Objective】It provided theoretical basis and technical support for high yield and high quality cultivation of strawberry in autumn and winter in north China.【Methods】The effect of 4 treatments on photosynthesis of dormancy strawberry was studied with“Jing Tao Xiang strawberry” as experimental material,and control （CK）,CO₂ enrichment （CO₂）,long-day photoperiod （LD）,and long-day photoperiod +CO₂ enrichment （LD+CO₂） were set up.【Results】Long-day photoperiod+CO₂ treatment significantly promoted the growth of dormancy strawberry leaves.The petiole became longer and the area of single leaf increased.The SPAD value and net photosynthetic rate of dormancy strawberry leaves were increased by long-day photoperiod,CO₂ enrichment and long-day photoperiod+CO₂ treatment.The photosynthesis of strawberry leaves could be influenced by long-day photoperiod and CO₂ enrichment by adjusting chlorophyll content and stomatal factors.The content of soluble protein,starch and soluble sugar in dormancy strawberry leaves could be significantly increased by long-day photoperiod+CO₂ enrichment.Compared with long-day photoperiod and CO₂ enrichment alone,the coupled treatment of the two had a better effect on promoting the growth and photosynthesis of dormancy strawberry leaves.【Conclusion】LD and CO₂ treatment could improve the photosynthetic rate,accelerate carbon assimilation,accelerate the formation and accumulation of photosynthetic products,and promote the growth of dormant strawberry leaves.

Key words: Strawberry, Dormancy, Long-day photoperiod, CO₂ enrichment, Photosynthesis