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With more application of electromagnetic equipments in wind tunnel, electromagnetic interference has seriously affected the accuracy and reliability of force experiments. The research about electromagnetic compatible of force measured data acquisition system can solve the problems of electromagnetic interference, make tests go smoothly. The force measured data acquisition system of wind tunnel was studied as the research object in the paper. With the help of analyzing the electromagnetic sensitivity of the system and the way of electromagnetic interference, some reasonable steps were taken. In the result, the force measured data acquisition system’s capability of anti- electromagnetic interference was improved, the reliability and stability of the test data were ensured.