Abstract: To solve the real-time partition schedule problem in the integrated modular avionics, a two-level hierarchical schedule model was proposed in which the operation system adopts round-robin scheduling strategy and each individual partition adopts dynamic priority scheduling strategy. For the schedulablity analysis problem, the system consume time was calculated based on the task demand bound function by using round-robin time and partition task performance rate as the key parameters. From the calculated system consume time, the partition schedulable judging condition was obtained. The schedulablity calculation bound was also developed by observing the task each implementation with the releasing jitter. Through studying the relationship between the round length and the task periods, the maximum task load upper limit utilization were developed under the condition that the partition was schedulable. For the partition design problem, the partition scheduling key parameters analytical model was established. Then the partition designable judging condition was got. Finally, a practice example was given.