ZigBee technology is a hot topic, which has the characteristics of low complexity, low power, low data rate, low cost, etc. and has varies of applications. In this paper, firstly, ZigBee topology and ZigBee protocol are introduced. Then ZigBee Application technology and various communication modes' characterizes are analyzed. The current ZigBee technology's key problems are summarized and the design example are put forward. Finally, the direction of future research is summarized.