For the sake of meeting the requirement of simulation applying and simulation surroundings changing, Simulation Software Architecture (SSA) always use the means of Software Reuse. Along with the expand of component stock, the size and the architecture of SSA become more and more complex. How to optimize the architecture becomes the problem when we exploit software. This text creates the concept model of SSA architecture, using reach-ability matrix, defining the concept of Component Contribution Degree (CCD) and Component Reliant Degree (CRD), provides the measure of quantitative analysis the architecture. In particular, this text gives the rule of optimize when we add or delete or coalition etc, it’s a fine strategy of developing software and optimize architecture.