The invention discloses a large-scale parallel program property-predication realizing method based on representative replay, belonging to the technical field of parallel program property prediction. The method comprises the following steps: collecting communication sequences and calculation vectors of parallel programs, analyzing calculation similarity of the processes, selecting a representativeprocess, recording the communication content of the representative process, using a calculation node of a target platform to replay the representative process, obtaining the sequence calculation timeof the representative process, and using the calculation time to replace the calculation time of other processes; obtaining the communication records of the parallel programs; and using a network simulator to automatically predict the final program property. By using the invention, only few hardware sources can be used, and the accurate parallel program property prediction can be obtained.