Zhonggansuo 091 seedless Orah mandarin is a new variety of citrus fruits bred through γ-ray mutagenesis. The tree is robust. The fruit is high in sugar, crispy, juicy and with a strong flavor. Ripe fruits remain on the tree for a long time and very few drop in winter. Unlike ordinary Orah mandarins, the fruit is seedless. After years of experiments, the feature remains stable. Zhonggansuo 091 seedless Orah mandarin is embryo sac aborted and cultivated in separate plots. Most of the fruits are completely seedless, and a very small number of fruits have 1-3 seeds.