Abstract: Effect of fertilization and water treatment on cracking, yield and quality of Duweiwendan pomelo fruits was studied.The results showed that by annual application of 25 kg rotten poultry manure, 7kg plant ash, 4kg nitrogen-phosphorus-potassium fertilizer, 1kg urea, 0.75 kg calcium nitrate, 0.1kg magnesium sulfate and 0.1kg zinc sulfate to each plant, and at the same time, controlling the water supply at 65% to 75% of the normal usage level during the fruiting period, the fruit cracking rate was reduced by 42.5% to 52.5%.In fact, appropriate fertilization and water management would, at the same time, benefit the soil physical and chemical properties while improving the quality of Duweiwendan pomelo.