对于占输水系统主体的中小型渠道,土保护层塑膜防渗渠道具有许多显著优势。但是土保护层塑膜防渗渠道的防渗效果却受诸多因素制约,该文从保护层的土质、铺膜范围、膜料厚度及土保护层厚度四个因素分析了对防渗效果的影响,从而为提高土保护层塑膜防渗渠道的防渗效果提供了参考依据。 For small and medium-sized channels, which account for the main part of the water delivery system, there are many significant advantages in the seepage prevention channels of plastic film for soil protection. However, the seepage control effect of impermeable canal in soil protective layer is restricted by many factors. This article analyzes the effect of seepage control effect from the factors of soil quality, filming range, film thickness and thickness of protective layer , Which provides a reference for improving seepage prevention effect of impermeable canal in plastic film.