The system logic model determined in the requirement analysis stage is the basis of future design and Achieve the goal system, so it must accurately and completely reflect the user's requirements. System analysts are usually computer software experts, and technical experts generally don't like to set about specific design. However, once analysts start talking about the details of program design, they will be separated from users, so that they can't continue to put forward their requirements and suggestions. The method of structural analysis and design used in the software T-process sets a specific end standard for each stage. In the requirement analysis stage, a complete and accurate system logic model must be put forward, which can only enter the next stage after being confirmed by the user.