Abstract: The internal quality and external appearance of 67 Ponkan ( Citrus reticulata Blanco) fruit samples from main production areas of 9 provinces or municipality in 2001 and 2002 were analyzed. The results showed that the percentage of large (180.60 g ±9.98 g) , medium (151.24 g ±7.48 g) and small (122.51 g ±141.1 g) f ruits is 42.9 % , 44.9 % and 12.2 % respectively ; the average Brix of total samples is 12.5 % ±1.1 % and the Brix of some samples collected from Rong county of Sichuan , Pinghe county of Fujian , Songzi county of Hubei , etc. is less than 11.5 %; the percentage of high (0.95 % ±0.10 %) ,medium (0.69 % ±0.07 %) and low (0.49 % ±0.07 %) acidity is 22.4 %、34.7 %and 42.9 % respectively. However , fruits from different production areas did not show significantly difference in peel color, Brix and vitamin C content . The fruit size from middle-southern Fujian province is nearly the same as that from southwest area of Sichuan province, but is significantly larger than those from areas of northern Fujian and Xuzhou , Lishui county of Zhejiang province , and western Hunan or western Hubei areas. There is no difference in acidity content between middle-southern Fujian and southwest Sichuan ; both areas have lower acidity content than the other two areas. Additionally , the fruit from southwest area of Sichuan is significantly higher in the ratio of Brix/ acid , and lower percentage of edible part than those f rom the rest three areas.

Key words: Ponkan (Citrus reticulata Blanco), Fruit, Outer appearance, Internal quality