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We study the order reduction method of the rotational relativistic Birkhoffian equations. For a rotational relativis-tic autonomous Birkhoffian system, if the conservative law of the Birkhoffian holds, the conservative quantity can becalled the generalized energy integral. Through the generalized energy integral, the order of the system can be reduced.If the rotational relativistic Birkhoffian system has a generalized energy integral, then the Birkhoffian equations can bereduced by at least two degrees and the Birkhoffian form can be kept. An example is given to illustrate the application of the result.