In this paper, we propose a synthesis model for software reliability. For the time being, the assumptions that the architecture-based measurement makes do not address the accurate reliability of components in software, resulting in inaccuracy or even incorrectness in evaluating the software reliability. Therefore, we propose a new reliability measurement based on the software architecture, the complexity and the degree of component importance in software. The central idea of the strategies proposed in this paper is to incorporate the above three reliability measurements into one software reliability model so as to make the software reliability model more adequate and fit to the real situation.