Abstract: The studies on the characteristics of Katy apricot for protected cultivation was carried out in Shandong Pomology Institute, Taian City, Shandong 271000, P. R. of China. The results of the experiments show that: Katy apricot's light and CO2 saturation of were lower, therefore, it can grow well in the low light and CO2 condition. On the other hand, it’s chilling requirement was low too. It has such good characteristics as high-stable yield, high self-fruitful ability and low pistils abortion rate. Under the conditions of protected cultivation, Katy apricot can significantly improve its average weight, quality and yield of fruits. Katy is the best apricot cultivars for protected cultivation.