Verification is meaningful for ensuring the correctness of workflow process definition. This paper focuses on semantic verification method, solving the problem of conflict checking under the combination of control flow, data flow and resource dimensions of workflow processes. Firstly, a formal model for process description— 3DWFN is defined responding to the requirement of semantic verification, and then reduction rules accomplishing semantic verification are stated in details based on 3DWFN nets. Finally, their advantages on semantic verification layer are compared with the existing reduction rules in the literatures.