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介绍了北京谱仪（ＢＥＳ）触发判选系统的模拟程序，并用实验数据对其正确性作了验证．运用该程序，首次用 ＢＥＳ的蒙特卡罗（Ｍｏｎｔｅ Ｃａｒｌｏ）数据从系统角度直接给出了触发判选效率，所得结果与实验方法测定的触发效率相一致，说明触发判选系统符合ＢＥＳ物理取数的要求．该模拟软件可以用来完备ＢＥＳ的Ｍｏｎｔｅ Ｃａｒｌｏ程序库，并可为今后触发系统的研究提供参考数据．
The simulation program of Beijing BES triggering selection system is introduced, and its correctness is verified by experimental data. Using this program, the Monte Carlo data of BES was used for the first time to give the triggering efficiency directly from the system point of view. The obtained results are consistent with the triggering efficiencies measured by the experimental method, indicating that the triggering selection system meets the BES physical fetch number Request. The simulation software can be used to complete the BES Monte Carlo library and provide reference data for the future research of triggering system.