Dynamic voltage and frequency scaling technique (DVFS) has been introduced to manage system power at software level. In this paper, we firstly discussed the disadvantages of commercial CPU frequency governors on interactive systems. Then, we proposed and implemented a new DVFS scheme aimed at Interactive Systems. The scheme is designed to save system power based on the premise that user experience must not be declined. Experimental results demonstrated that most application can save more than ten percent power compared with the original Ondemand DVFS governor, and even more than thirty percent for some other applications.