Abstract: FF fieldbus control system(FCS) is a kind of typical distributing real time system, the interaction of function blocks and communication tasks which distribute on different-device and bus implements complicated control scheme.In addition to constraint of time, constraint of sequence and resource is considered. Scheduling problem is NP-complete problem. According to characteristics of FF system, this paper holds scheduling model is similar to job shop scheduling problem. After designing rules of code /decode and fitness function, scheduling table which is satisfied with all constraints is constructed with genetic algorithm (GA), it can schedule FF system without jitter. Scheduling condition is discussed at last.