Top vents are most critical for rain prevention. Prepare light-transmitting plastic film sized to cover vent opening. Hang film from greenhouse roof using wire, fixed at top, secured at bottom to the column below vent. Rain flows down into drainage channels. After rain, to prevent disease spread, promptly clean field debris and remove diseased plants and yellow leaves. Increase ventilation in favorable conditions. After heavy rain, soil compaction occurs; timely shallow cultivation improves soil physical properties and root activity.