Context awaress is one of the essential characteristics of the ubiquitous computing environment.Through the division of context space

this paper proposes a hierarchical distributed context awareness model which describes the layered abstraction from sensor data to context information.On the basis of the hierarchical model

this paper gives the detailed specification of the diversified roles of a context awareness system and the relationship between those roles.At the end of this paper

the simulation experiment is built to compare the proposed model with typical Context Toolkit model.The experiment shows that the proposed model has an advantage of lower runtime payload over the Context Toolkit model.Through the analysis on the activeness of the model

it is proved that the aware activeness is proportional to receiving data payload and inversely proportional to sending data payload.The hierarchical model which will play an important role in the configuration of a distributed context awareness system.