The correlation between the sweep ratio and test time shown by sinusoidal vibration test octave, and calculation formula of power spectral density at origin of ascension, descent segment and root-mean-square acceleration with slope by octave is presented in random vibration test. It is useful for designers and experimentalists to understand the vibration environmental test conditions of launch vehicle.%推导正弦扫描试验倍频程表示的扫描率与试验时间的相互关系，给出随机振动试验条件由倍频程表示的斜率对应的上升段、下降段起始点功率谱密度及均方根加速度的计算公式。对扫描率、功率谱密度的斜率和上下限、总均方根加速度等有关内容进行解析，提高设计、试验单位的工程人员对振动环境的认识。
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