Abstract: The methods of QFD (Quality Function Deployment) and FPBS (Function- Principle-Behavior-Structure) are combined to improve and obtain the innovative design process for the engineering device. Under the guidance of the process, facing the requirements of the nuclear radiation environment and the explicit expressing of tacit knowledge based on cognition, an electron gun transport device is designed to meet the needs of the project through the design of material, structure and control mode . The device satisfies the basic requirements of the nuclear radiation environment, and  the reliability of the innovative design process of this engineering device is verified.