Based on the summarizing and analyzing of data caching technology, this article presents three-tier-architecture spacial data caching model, and particularly addresses the mode of realizing data caching in every tier aiming at the feature of spacial data management and access in every software tier. In the following, it describes the reason for causing inconsistency of spacial data in three-tier architecture, as well as the measure maintaining consistency of spacial data in every tier. Finally, the article evaluates the spacial data caching method in three-tier architecture mentioned above.%对数据缓存技术进行总结分析的基础上,首先提出了三层体系结构空间数据缓存模型,并针对各软件层空间数据管理及访问的特点,详细论述了各层空间数据缓存的实现方式；然后论述了三层体系结构中空间数据不一致的原因及各层空间数据一致性维护策略；最后对提出的三层体系结构下空间数据缓存策略进行了评价分析.
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