In order to provide a theoretical basis to ease the peel-pitting and improve fruit quality of the fruit of Tarocco blood orange，the relationships among Tarocco blood orange’s peel-pitting and the contents of nitrogen，phosphorus，potassium，calcium and boron in different organs and tissues and the fruit quality were studied.10-year-old Tarocco blood orange grafted on Poncirus trifoliata L. in fructescence was used as material in this experiment.According to the degree of fruit peel-pitting and its proportion in the whole fruit surface，the inner crack was divided into three types，including health fruit(HF)，slightly peel-pitting fruit(SlF)，severely peel-pitting fruit (SeF).The contents of nitrogen，phosphorus，potassium，calcium and boron in pericarp，flesh，branch，blade and exterior and internal quality index of different degrees of peel-pitting Tarocco blood orange were determined and analyzed in order to find the discrepancy of the quality of fruit in different degrees of peel-pitting blood orange.The sequence of nitrogen content in branches of Tarocco blood orange was SlF>HF>SeF，phosphorus content was SlF>SeF>HF，potassium content was HF>SlF>SeF；the contents of nitrogen，phosphorus，potassium in blades and pericarp of different types of peel-pitting fruit were not significantly different；the content of nitrogen in SeF pulp was significantly lower than that SlF and HF，while the content of phosphorus and potassium had no significant difference.The sequence of calcium and boron contents in branches，blades and pericarp of different types of peel-pitting Tarocco blood orange was the same，which was HF>SlF>SeF；the sequence of calcium content in pulp was HF>SlF>SeF，while the sequence of boron content in pulp was SeF>SlF>HF.Both of the sequence of weight of whole fruit and pericarp were HF>SlF>SeF.With the increase of the degree of fruit peel-pitting，the color of the fruit surface gradually turned yellow，the peel gradually became thinner，and the hardness gradually decreased，while the TSS，TSS/TA and anthocyanin content of the fruit increased.The preliminary results showed that there were significant differences in the calcium and boron contents and fruit quality between HF and peel-pitting fruits.The fruits with high calcium and boron contents in pericarp were not easy to be peel-pitting，but the fruits with high boron content in pulp had slightly better internal quality.Whether the nutritional levels of calcium and boron affect the activities of related enzymes in the peel and pulp of Tarocco blood orange，and thus further affect the pectin content，peel strength and ductility，etc.，further systematic and in-depth studies on the regulation of calcium and boron and other nutritional elements are needed，which can provide theoretical basis and technical support for scientific and reasonable regulation of calcium，boron and other nutrient levels in different organs and tissues of Tarocco blood orange and alleviating peel-pitting.