Shatangju fruits were divided into the big fruits （〉42 mm）, middle fruits （36.5-42 mm） and small fruits（〈36.5 mm） according to the fruit diameter. The changes of post-harvest qualities and storage property of citrus （cv. Shatangju） were studied during storage at 5 ℃. The results showed that, the size of Shatangju fruits had a greater effect on the storage quality. During the later period of storage, the values of hue angle and lightness of small fruits were higher than the middle and big fruits, and also had better commodity value from the appearance quality. During the whole storage, the contents of TA, VC and TSS of small fruits were always higher than the middle and big fruits, and had significant difference to big fruits. The big fruits, small fruits and middle fruits respectively began to appear bad fruits after 20 d, 30 d and 40 d in storage, and weight loss rate increased continuously. The increasing speed of weight loss rate was biggest during 30-40 d in storage, and it began to appear creasing fruits. It showed that senesce speed of fruits began to accelerate after 30 d in storage at low temperature. At 50 days in storage, the good fruit rate was middle fruits 〉 small fruits 〉 big fruits, and there were significant differences among them. In summary, the storage effects and flavor of small and middle fruits were better than big fruits, 30 days was a critical day for Shatangjiu fruits cold storage without other treatments.