This research was motivated by a real problem in an aircraft company which has m batch processors (BP) flow shop in this machine order ; BP₁ - BP₂   -…- BP_m . The number of parts in a batch can be processed on a BP simultaneously. Under multiple items condition, the demanded part requires a different processing time which it depends on the type of item. Completed parts will be delivered simultaneously at a common due date. We developed a batch scheduling model for this problem by adopting the total actual flowtime part (F^a ) as an objective function. Numerical examples are done by using the Lingo software, and the results showed that the model can guarantee F^a is minimum, the due date and the flow shop rules are fulfilled under flow shop condition.