Abstract: The development and factors of jujube-fruit shrink disease were studied according to the experiments conducted in 6 jujube gardens in Dali county from 2005-2007. The results show that pathogens started to infect the fruit in the first ten days of May. The disease were begun from the mid ten days of June, and reached the peak from the last ten days of August to the mid ten days of September. The pathogen spreaded mainly by wind or rain, and penetrate down the dot of fruit or fruit depression. The pathogens could overwinter in many organs, such as bark, once branches, fruiting branch, fruits, and deciduous, But the fruits were the most important infection source. The shrink of fruitis closely related with fruit development, fruiting branch location, fruit number, tree vigor, weather factor, stand site, insect attack, management, and variety. Some suggestions for farmers are given.