他们在地上撒一些麦粒谷颗之类，在上面盖一顶筛子，再用小树杈把筛子撑起，在小树杈上拴一根长长得绳子，人拉着绳子躲在暗处，看到麻雀们钻进筛子下面吃食，就赶快把绳子一拉，这样，麻雀们便捂在了筛子下面，成了“瓮中之鳖”，实际上是“筛下之雀”。
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