The natural rot Shatang orange fruits were used to isolate and identify the pathogen.,The effects of nano TiO₂-chitosan coating on the quality of Shatang orange and inhibition of fungistatic ability in vitro experiment were investigated.The results showed that the main pathogenic fungi on Shatang orange was Penicillium digitatum.The coating contained with 2% chitosan and 2% nano TiO₂ can maintain higher firmness,soluble solids and titratable acid and Vc content,significantly reduce the growth of P.digitatum and the lesion diameter.It was suggested that the nano TiO₂-chitosan coating can maintain the natural quality and inhibit the postharvest diseases of Shatang orange.