Abstract: Design of hardware system, which consists of PC and embedded application system, is proposed.The hardware system is used for experiment of coarse signal processing methods of AC power smart sensor.In embedded system, STC89C52 chip is used as microprocessor, and voltage transformer TV19 and current transformer TA17(L)-04 are adopted to perceive the AC power signal.The signal conditioning circuit is designed based on operational amplifier chip LM324, while the A/D conversion circuit is designed based on chip ADC0809.The protection function and storage of the system information and the system serial communication and display of the system information, are implemented by using chip MAX813L, chip AT24C512 and so on.The system provides a necessary hardware platform for the study of coarse signal processing method for AC power intelligent sensors.