Abstract: Analyzing some conventional ways to construct data warehouse, a time rotation model that can be used to construct data warehouse is developed. The concept and implementation principle of basic time rotation mechanism are introduced and characteristics of this model are analyzed. The method of constructing a basic time rotation model based on rough time set and related operations are described with its application exemplified. Compared with conventional data warehouse construction strategies, the time rotation mechanism can provide the idempotence for data totaling and is more serviceable for on-line analytical processing, data mining and decision supporting system. The data extraction efficiency, data storage efficacy and operation convenience of data warehouse constructed by the time rotation model will be improved obviously.