False information transmission flaw in Integrated Modular Avionics (IMA) system would seriously impact the aircraft safety.To improve the integrity of IMA system time transmissiona highsafety time management technology for IMA system was put forwardby which all published data on IMA platform will be transferred to subscribers as requested at one designated time window.By using multitime management servicedeviation table between each subsystem and time management service was set upto identify the relationship between local time reference (LTR) and the time reference of each remote subsystem communicating with LTR.The time management technology provides subsystems hosted in IMA with highsafety time synchronization mechanismcoordinates the separated hosted subsystems to safely execute a task togetherthus can satisfy the time synchronization and safety requirements of IMA system.