With the improvement of SoC design flow, early system prototype is an efficient way in which designers can find function bugs and performance limitations. The SystemC transaction-level model, a high level system model, has been attracted great attentions in embedded system design community. In this paper, we present a system prototype methodology, its corrective modeling technique and development environment. Our transaction-level executable model covers the range from top-level specific application to low-level infrastructure and some OS-like support functions. We develop a tool called transaction viewer to analyze the simulation results. The demonstration of audio communication is provided as an example for highlighting the whole design process.