To assure efficient expatriate assignments, the objective of this study is to establish prediction rules of employees’ expatriation willingness using the rough set theory and decision tree. We summarized 22 impact factors from literature regarding expatriation willingness and used them to develop a questionnaire. A total of over 413 questionnaires were returned and effective for data analysis. The adoption of the rough set theory classified these factors into three categories. Among them 18 out of 21 factors were set as the inputs for the decision-making model to construct the prediction rules of employees’ expatriation willingness. Six rules regarding the refusal of expatriation assignments and three rules regarding the acceptance of expatriation assignments were found. The rules can be valuable to employers in making decisions of international expatriation.

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