Abstract: In order to explore the fruit development of extremely late maturing Longan species(Lidongben),the dynamic changes of fresh and dry weight,as well as the distribution of moisture and solute content in whole fruit or different parts of fruit were analysed by measurement of fruit weight at various maturing periods.The results showed that,the fresh and dry weight of peel increased with the development of fruit;the formation of aril and emergence of embroy occured in the approximately same period,however,the rapidly increasing period of dry matter accumulation in aril occured when the dry matter accumulation in embroy reached the peak period.The water and solute content at early fruit developing period mainly went into peel and kenel but it come to aril at the late period.In matured fruits,the highest water content was distributed to arils and the highest solute content was to the seeds.