In business process modeling, process (de)composition is one of means to reduce model complexity. However, it isn?t enough to fully reduce the complexity caused by cross-cutting concerns. This paper proposes a new process modeling approach: concern-oriented business process modeling, in which the concept of concern or aspectual process is introduced to business process modeling to support flexible process modeling, refactoring and restructuring by aspectual process identifying, modeling, extracting, assembling and weaving. The approach provides people a convenient way to more clearly view and easily manipulate process models from certain concerns? perspectives.