Comparative analysis method was usedto comparethe effects of irrigation water, fertilizer types, previous crop,varieties of watermelon, seeding sources, tillage measures, irrigation mode, root vigor etc. on watermelon seeding growth.The cause of dead seedlings in early springgreenhouse after raining was initially identified, that was the soil moisture. If themoisture content is very high in early spring when planting greenhouse watermelon seedlings, farmer must pay attention tothe drainage and waterlogging reduction, irrigate properly, dig deep draining-ditch between the greenhouses, andtransplant in high-ridge.