Due to high temperatures inside greenhouses, film easily produces water mist. This increases air humidity and causes droplets on vegetable leaves, creating disease conditions. Poor quality non-drip film causes water to form droplets instead of flowing as a film. Water flowing down film is blocked by wires and frames, accumulating and dripping. Solutions: use quality non-drip film with higher initial cost but less dripping, lower humidity, fewer diseases. Build curved light-transmitting surfaces to avoid film contact with blocking objects. Spray anti-drip agents or bean flour water on film inner surface when ventilation is open.