Compared to the traditional system engineering, the modelbased systems engineering(MBSE) is more understandable, detail, and efficient. The method based on the SysML(System Modeling Language) is widely used around the world. For system operational concept and system architecture design, using Arcadia method to implement the modelbased system engineering is simple, clear, and useful in the system architecture design and system operational definition. This paper coordinates with the system design objective and characteristic, in the modelbased systems engineering by comparing SysML MBSE method with Arcadia method.