借助任意截面直渠中的ｆＫｄＶ方程，理论上确定了先锋孤立子生成的平均特性。基于任意截面直渠中的ＡｆＫｄＶ方程，求得了先锋孤立子生成问题中的理论生成振幅和周期。作为例子，文中预报和比较了正方形和等腰三角形断面直渠中的生成周期和振幅。并且，理论研究也证实，对于正方形渠，当渠宽ｂ＝１时，所得的结果可退化为Ｘｕ［１］等人的结果。 With the help of the fKdV equation in an arbitrary section of canals, the average characteristics of avant-garde soliton generation are theoretically determined. Based on the AfKdV equation in the canonical cross-section of arbitrary cross-section, the theoretically generated amplitude and period in the generation of pioneer soliton are obtained. As an example, the generation period and amplitude of the square and isosceles triangular cross-section canals are predicted and compared. Moreover, theoretical studies also confirm that for a square channel, when the canal width b = 1, the result obtained can be degenerated into the result of Xu et al. [1] et al.