Nowadays smart terminals become increasingly multitudinous and popular. And because various sensors are embedded in them, the variety of applications in smart terminals is largely expanded. The information is widely used and valued in serious systems, such as date sensed by sensors, context of device's parameters and information inputted by users. Context awareness in smart terminals means more to us now. This paper proposes a new context awareness system based on self-adaptive ness and describes the interactive process. It considers how to draft conflict resolution mechanism based on the rule database updated by user's need. The usage of this context awareness system can be tightly combined with self-adaptive ness in smart terminals.