In order to help teacher master the remaining time of current class, improve teaching efficiency, the time can be calibrated remotely. A teaching time management system is designed. Realtime clock chip (DS1302) is used as reference time, the system is prewritten curriculum schedule, and recording the Beijing time and remaining time. ZigBee wireless network is built to send control commands to each node. The working principles of the system, the hardware design and software workflow are analyzed. The experiment turns out that the date acquisition and procession can be done by the system reliably, and remote control is realized, improving the applicability of the system.