This article firstly analyses the limitations of the existing office automation system, discusses workflow technique's characteristic, studies profoundly its application in office automation, constructs a system model of office automation based on workflow technique and gives the mathematical model of its workflow. On the basis of analyzing and comparing traditional development methods (Prototype Method and Life Circle Method), it reaches OA's development method which is based on workflow technique.
SWOT variation method and enterprise life circle method were utilized to conduct positioning analyses of total strategy and competition strategy. Then the structural cost and executive cost in coal industry were analyzed, driving factors of cost were determined, and importance of cost management was mastered in the industry.
In the BPR theory, it is attractive that life circle method divided process reengineering into strategies, makes and plans, diagnoses, redesigns and appraises six stages, which play a direct role in practice.
We must choose a process in the real develop process because UML is only a model language not a method which is process-independent. Rational Unified process is a life circle method that suit for UML, and when it combine with UML in the real develop process , it will make model process more straight and clear , besides it will lower the system development risk and suit the users' demand.