This paper describes an application of artificial intelligence technology to the implementation of a rapid prototyping method in Object-Oriented Performance Design (OOPD) for real-time systems. A prototyping process is composed of three steps: Prototype construction, Prototype execution, and Prototype evaluation. The authors present the following artificial intelligence based methods and tools to be applied to each step. In the prototype construction step, a rapid construction mechanism, using reusable software components, is implemented based on the planning method. In the prototype execution step, a hybrid inference mechanism is used to execute the constructed prototype which is described in declarative knowledge representation. In the prototype evaluation step, an expert system, which is based on qualitative reasoning, is implemented to detect and diagnose bottlenecks and generate an improvement plan for them.