The component-based model of dynamic evaluation was used to give a dynamic re-evaluation model.This model abstracts the information system to topological and combinational construction,reduces the connection between components into independent and collaborative relations, and the combinational relation of components into serial and parallel connection types. When the system changed, by only discussing the changed components and determining its change manner and impact scope, the rest of the components can be evaluated and the impact on the entire system can be assessed. Examples showed that the model breaks through the limitations of a traditional static one-time assessment and realizes the dynamic re-evaluation based on change.
