The "S" wave water distribution fill fully utilizes the rational design principle of trapezoidal inclined waves while increasing the frequency of water film interception, enabling multiple redistributions and greater uniformity of the water film. The addition of vertical convex滯留 waves enhances the lateral diffusion capacity of the water film, facilitating more thorough heat and mass exchange between water and air within the fill. It also slows down the downward flow velocity of the water film, prolonging the heat and mass exchange time and improving cooling efficiency. With large spacing between fill sheets and lightweight per unit volume, it prevents clogging by pollutants. The extensive water-air contact area, long flow path, and strong lateral diffusion capability ensure more uniform water film distribution. It features lightweight assembly and high load-bearing strength.