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For aspect oriented Web service orchestration, there are two major problems, aspect determination and crosscutting base with aspect. Contrary to other researches focusing on implementation, this paper presents an aspect oriented design method, Themes4BPEL. The novelty of this approach is that it includes five rules to differentiate aspect from base with three views analysis. And the test cases for travel reservation agency show that Themes4BPEL is capable for aspect determination and can combine with other AO middleware for aspect oriented service composition.