The invention discloses a solving method and system for a task-dividing and multi-pass scheduling model. By establishing the dividing task and multi-pass scheduling model, the model can be solved by utilizing an intelligent and optimized algorithm. According to the dividing task and scheduling model, by eliminating the time interval between any two adjacent multi-pass schedules, and an analytic solution of an allocation scheme relating to the scheduling time and number of processors is deduced. According to the intelligent and optimized algorithm provided by the solving method and system for the task-dividing and multi-pass scheduling model, the most optimized scheduling times and the needed processor number can be determined efficiently and accurately, so that the best task allocation scheme satisfying the condition that the time for completing the task is the shortest is obtained.