The division of decision table based on rough sets

This paper firstly introduces rough sets theory, This paper gives a new thought that we can not only divide some set, but also we can divide decision table. So this paper proposes a kind of method for decision table, when we deal with a complex information table or decision table, we can divide it into some simple parts, each can be easy to be handled, so one complex information table or decision table could be easy to be handled when divided into several simple parts, which is the main content. In addition, this paper gives some properties.