The study used 113 culitivars, which belong to different species, as experimental material to evaluat the character and suitability of juice-processing and select the excellent germplasm. The experiment revealed the primary physical basis of enzymatic browning and the change of nutrient material in non-enzymatic browning by way of studing physiological characteristics of different species and cultivars. The effects of different treatment on browning inhibition of pear juice were also be explored, and the op...