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The Parallel File System based on NOW is focus more and more. This paper briefly describes a Parallel File System based on NOW-PARFSNOW++. We put special focus on the technique of Cooperative Cache. Aiming at the existed problem of current Cooperative Cache mechanism,we introduce a new mixed Cooperative Cache mechanism used in the PARFSNOW++,we also present the cache coherence mechanism and the data replace mechanism used in the mixed Cooperative Cache mechanism.