Abstract: Synchronization strategy is one of key techniques in PDES（Parallel Discrete Event Simulation）.POSE is one of object-oriented and extensive computer architecture simulators，which is suitable for parallel simulation of large system.This paper analyzes the optimistic strategy in POSE，and then divides the adaptive strategy into two categories which include the half adaptive strategy and full adaptive strategy；Finally，the half adaptive strategy with the full adaptive one is compared and it’s a fact that the half adaptive one can work better after repeated tests.Some problems of these strategies are also found，such as late feedback of time window regulation and large GVT computation overhead.