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This paper presents a context-aware infrastructure for the easy creation and flexible deployment of the context aware application. We introduce the concept of plane in this infrastructure to manage the sensors which are distributed in the communication environment and used to collect the specific context information. A layered structure of the context information is designed based on this infrastructure. Especially, the Demspter-Shafer evidence theory is applied in the design of the reasoning mechanism in this infrastructure for its superiority over Bayesian method in handling the uncertainty problem, and the inferencer is constructed based on the combination rule of this theory. We also choose the rough set theory and genetic algorithm to design the aggregating mechanism and construct the aggregator.