Web仓储是使用物化视图方法有效利用Web信息的重要技术。Web仓储系统进行刷新的目标是追求最大的系统时新性,不同的数据时新性标准,决定着不同的系统刷新方案。文章提出了一种基于“状态-效果”的系统时新性标准。分析和实验都表明,所介绍的标准和传统的基于“状态”的标准有着本质不同,它不仅倾向于用户查询结果的最佳化,视图刷新方案也有较强的可操作性,特别适合于复杂多变的Web环境。 Web warehousing is an important technique that uses materialized view methods to make effective use of Web information. The goal of refreshing the Web warehousing system is to pursue the greatest newness in the system. Different data standards will determine different system refreshing plans. The article proposes a new system standard based on “state-effect”. Both analysis and experiment show that the introduced standard is different from the traditional “state” based standard in that it not only tends to optimize the query result of the user, but also has a strong operability of the view refreshing scheme and is particularly suitable for complex Changing Web environment.