Abstract: According to the status quo of modular design research, especially the lacking of process support, closed-loop feedback and optimization for module system, a method of dynamic modular design and its framework of technologies were proposed based on the point of systematic and synergetic theory. Using the model of design process and the model of multi-agent transaction processing system, mechanisms of tasks scheduling and conflicts resolution were put forward, and used for process collaboration and feedback analysis, and application of specification formed by modular analysis and improvement of product architecture in the combination phase. Finally, the effectiveness of the method and its frame for current problems is verified through the development of prototype software system and its application in the design of a tanks engine based on a specific serial.