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用详细的计算数据，在保持计算条件和总冲不变的情况下，分析了二级推力和三级推力方案时的方向密集度，从而得出了二级推力方案的方向密集度优于三级的结论，同时，提出了使方向密集度最小的最佳转换时间。
With the detailed calculation data, the directional density of the second-level thrust and the third-level thrust scheme are analyzed under the condition of keeping the calculation condition and the total impulse constant. It is concluded that the second-level thrust scheme has better directional density than the third At the same time, the optimal conversion time to minimize the direction density is proposed.