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Service-oriented business process construction is a technology that Web service components are directly mapped to the visualization graphical components. Business people are allowed to construct main logic structure of the business process through dragging and dropping the graphical components, then platform automatically generates BPEL elements and attributes by parsing WSDL. The BPEL elements and attributes which platform could not automatically generate will be specified by business people with help of user-friendly visual interface. In addition, it's necessary to display available variables for business people in order to copy data from one variable to another. However, when the scale of business process is very large, it's unfeasible to show all available variables for business people. To solve this problem, in this paper, we propose and prove two theorems used to filter out some variables, and the remaining variables are sorted in accordance with similarity among the variables so that make business people are able to quickly navigate the variables needed. In this way, platform hides some details of BPEL language for business people. Therefore, as long as business people are familiar with the business knowledge, they could use platform to construct business process that meets the needs of business. Thus speeding up the development efficiency of business process and reducing cycle of business process reconstruction.