Abstract: Contents of soluble sugars and minerals in the fruits of Sijiyou pummelo(Citrus grandis(L.) Osbeck) were determined.The correlation between them during fruit development could help better understand the nutritional regulation of and improve the fertilization practice for the plant.It was found that,during the development of the fruits,the soluble sugars in the flesh increased in mid-August,and all major components accumulated continuously.On the other hand,the contents of N,P,K,Ca,Mg and S in the flesh and peel decreased gradually.A significant correlation appeared to exist between the contents of soluble sugars in flesh and the accumulated K of the individual fruit.