In the developing process of an applicative system or a professional knowledge system, first we collect the required information by investigation, next study fully all kinds of rules, information, methods, programs and tasks, then abstract a general logic pattern so as to develop a matching applicative system or a professional knowledge system, finally perfect and optimize the system by means of relevant assessment criterion and methods. The system developed as above can efficiently imitate, reflect and realize the real work process. As for improving the efficiency of system and its development, improvement and creation of the theory and method of gaining and analyzing the required information in its developing process, the formation of the system’s general logic model, the system’s actual development and the design, assessment and perfection of the system are needed. Combined with practice, this article has showed some related creative research in every step in the base of the developing theory.