| In this study, introduced nine varities of Jujube (Ziziphus mauritiana Lamk) were cultivated in greenhouse at Institute of Forestry and pomology, Beijing. Contrast trail on biological and photosynthesis characteristics, leaf photosynthesis, and cold-hardiness were carried out. The corresponding techniques of culture management and the possibility of cross breeding were also studied. The results are showed as follows:(1) Each varities of green jujube can easily grow up in greenhouse in Beijing. According to the comparision in leaves characteristics, flowers and fruits between 9 varieties. The most suitable variety is"Galo", three subsequent varieties are"Biyun","Cuimi"and"Wuqianzhong".(2) The trails on hardiness of green jujube showed that different varieties are different in cold-hardiness and blight tolerant. The cold hardiness of"Huangguan"is the worst of all, while"Wuqianzhong"is the best. Besides the lower the temperature is, the higher the cold-hardiness is. The green jujube must be cultivated in the greenhouse of high temperature and high moisture, only in this environment, can it pass the winter, but it can be affected easily. Of all these varieties,"Mizao"did the worst in defending the blights, while"Miandian"and"Biyun"better. It is very important for us to find a environmentally friendly method of defending blights.(3) The reseach on culture and management techniques indicated that (a) The optimization ratio for N,P and K fertilizers is N:P:K≈3:1:3. (b) A spray with 15ppm GA in blooming.(4) The trails on high yield showed that both trunk gridling and shot priching can improve the fruit set of green jujube. And that both gridle trunk and the first branch did the best. Also, root pruning can also improve the set effectively, while the trails showed that if we only prune two sides or one side the first time, and then prune another one side each time, in this way, can the fruit set be improved obviously, while it was of no effect pruning four sides of the roots at the first time.
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