Abstract: In order to improve the quality and yield of winter jujube,in this study,winter jujube（Zizyphus jujuba L.）was used as the research material to compare the photosynthetic characteristics of winter jujube leaves under the conditions of arched shed and open field cultivation.The experimental results showed that the net photosynthetic rate（Pn）of winter jujube under the two cultivation conditions was a double peak curve,and there was a significant phenomenon of photosynthetic noon break.The two peak values of daily variation of winter jujube under the arched shed cultivation were lower than those in the open field cultivation.The variation trend of intercellular CO₂ concentration（Ci）,air hole limit（Ls）,transpiration rate（Tr）,water use efficiency（WUE）,stomatal conductance（Gs）and net photosynthetic rate light response curve of winter jujube under the arched shed and the open field cultivation conditions was similar.The light compensation point of winter jujube under the arched shed cultivation was lower,and the light saturation point of winter jujube under the open field cultivation was higher,showing different light adaptability.