In the era of system-on-chip, many hardware modules are embedded on a single chip. More messages communicated among on-chip modules. On-chip communication bandwidth is thus scaled up dramatically. It causes significant increase of routing area as well as relative reduction of system performance. It affects overall feasibility of a system chip. In order to solve the problem and meet the communication performance requirement of application systems. We need to consider factors that affect overall system performance and cost, communication resource allocation, message routing, and transmission control design. Thus, we proposed a soft real-time communication synthesis method. It applied the simulated annealing optimization method.. In the process, it carries out several tasks: calibration of dynamic communication cases, communication resource allocation, message routing path generation, and estimation of overall communication performance and system cost. In this research, we designed the experimental software of the communication synthesis method. We will perform experiments for its system evaluation to verify its effectiveness on system-on-chip designs.