Abstract: The pipeline of SPARC simulator is modeled using open queuing network in allusion to instruction set feature of SPARC processor.In the light of distributing of SPARC instruction set in the practical projects and flowing in the pipeline modeling，the modeling of pipeline queuing network is analyzed.Total delay and mean delay are computed in the every routes and queuing network delay is computed.Improved scheme is put forward as a result of delay data.Serving time of server nodes is averaged in virtue of partitioning for pipeline modeling and adding processing node of executing model.In conclusion，the delay data before and after ameliorating pipeline scheme are analyzed：The delay distributing of last scheme is almost equal and choke point with long delay and unequality is avoided.