In order to solve the problem with the prefecture-county integrated dispatching automation system of how to keep the whole system running without losing important data in the splitting operation state，a method is proposed for system solution of data cache and synchronization on the parallel and splitting operation side of the prefecture-county integrated dispatching automation system.With this method，two ways are adopted for the splitting side after splitting operation of the integrated system，that is，local file cache and cache in the local real-time database system.In addition，following the recovery of integrated operation on the splitting side，synchronization of the whole system is carried out using the metadata cache.This method is applied in the Nantong prefecture-county integrated dispatching system.