The invention discloses a safety guaranteeing estimation flow process control method of relational data bank, which comprises the following steps: (1) appraising flow process leading-in by information technique produce safety guaranteeing component; inputting the operation and selection which is needed by estimation flow process; depositing the estimation flow process in component estimation flow process and object list, wherein the component estimation flow process meter consists of component estimation flow and the result of estimation course; the safety component estimation needs to inquiry component action meter and action unit meter; the estimation meter is retored in componet estimation flow process meter; (2) taking out evaluating guaranteeing component from estimation flow process; selecting one component with 0 degree dependence layer from componet flow process meter, wherein the treatment state sign includes estimation result; (3) controlling the evaluating to the safety guaranteeing component; (4) adjusting componet sequence of estimation flow process; (5) according to the estimation result and estimation mode to decide if the estimation flow process is going on.