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In order to solve the problem of excitation in the simulation of signal integrity and power integrity, exploring the worst working environment of airborne bus acquisition module, this paper focuses on the worst-case excitation producing. Based on the principle of synchronous switching noise, combining the square wave excitation with the pseudo-random binary sequence, the worst-case excitation is generated. In this paper, by introducing the excitation generated by different duty cycle gating wave into three kinds of simulation environments based on airborne bus 1394B acquisition module, the influence of different duty cycle gating wave on the output eye diagram of the system is studied. In the original airborne bus acquisition module simulation environment, the output eye height and eye width of 1/2 duty cycle strobe wave are reduced by 85mv and 3.56ps, compared with that of 3/4 duty cycle gating wave. In different power network transmission performance and signal network transmission performance, the excitation of 1/2 duty cycle gating wave is the worst-case excitation. The concept of this paper provides suggestion for the integration design of the localization high-speed bus acquisition module, and gives a idea for acquisition module debugging.