| As an entertainment, online games have been accepted and loved by more and more people with the continuous improvement of people's living standards in recent years, a large number of online games have been putting into production and the keep investing of financial and human resources drive online game rapid development, the state also has brought online game technology into the 863 study.As the nation's attention, as well as continuous progress of development and production technology, online games quickly entered a MMOG (Massively Multiplayer Online Game, Massively Multiplayer Online games) age, the scale grows larger, the features increases, the amount of transmission data grows up gradually. However, because of the characteristics of relying on the Internet technology and client/server model, transmission delay and error become a prominent bottleneck restricting the entire game, so the study of online games synchronization technology has important realistic significance.This thesis provides an overview on massively multiplayer online game, gives a detail introduction of the network architectures as well as network protocols used in MMOG, analyzing the main factors affecting the synchronization of online games, give a serious description of several synchronization algorithms and introduced the design methodology of synchronization strategy,After deep analyze of Time Warp, there is an improvement algorithm of local delay on resource consume and rollback rate,through the corresponding experimental data and further demonstrated the advantages and disadvantages of the improved algorithm. Several approaches and recommendations of optimizing synchronization have been proposed.
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