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Trust estimation plays an important role in research of Trusted Computing. However, the method for trust estimation often has the property of oneness for the moment. In this paper, the degree of trust of a component is extended to a vector. To estimate the trust of a component, the relation of dependency between components is studied thoroughly, followed by the concepts of the path and path set. Using the above, a layered structure is presented and finally, the method for trust estimation is proposed.