In this paper, software architectures and architecture styles are modeled with attributed typed graphs and graph grammars respectively. Accordingly, dynamic reconfigurations of software architectures are modeled with graph transformations. Based on such a modeling, a supporting environment is constructed twofold. Firstly, the visual manipulation of the graphical representation of software architectures is supported with a graph grammar- enabled editor. Secondly, the graphical architecture model is reified as a runtime software architecture object built into the physical running system, through which graph transformations of the architecture model is then naturally reflected as dynamic reconfigurations of the running system.