When a BPEL process is executed，it is necessary to dynamically monitor the process. BPEL is an executable language，which is not suitable for visual monitoring. On the other hand，BPNW is designed to visually describe business process and is more intuitive for monitoring. To visually monitor a BPEL process，transformation from BPEL to BPMN is necessary. However，current study of transformation from BPEL toping does not support the transformation of "link" activity. Besides，no work has been done to add supplementary information into BPMN during transformation. In this paper，we transform nested Preprocess into a flat BPMN process graph without hierarchy through applying a flattening strategy. Especially，we analyze various scenarios of the transformation of link activity，and provide a method to deal with it. Besides，we analyze the mapping between BPEL activities and Bivalve graph,山rough which we found out that some supplementary information cannot automatically obtained from BPEL process. These supplementary information need to be added during transformation. At the end of this paper，we present the structure of our monitoring tool which is based on our transformation algorithm.
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