Abstract: Component based software reliability analysis typically takes the reliability of component as an invariable property of component itself , while disregards the fact that it is changed when the component context that it interacts with is changed due to a different route. This paper proposed a improved component based software reliability modelbased on route, which introduces the dynamatic transition graph to build the relationship between the route of component based software and component reliabity, and gave a improved method based on route to caculate the componet based software reliability. At last, the result of case demonstrates the feasibility and validity of the approach.

Key words: Component based software, Software reliability, Dynamatic transition graph, TE-NHPP