Abstract: A single fine plant of Longan strain "lidongben" was selected from the variation of seedlings in 1980. The investigation results showed that, this single fine strain has good habits in flowering and fruiting, with high yield,middle to large size of fruit body,thick pulp,high sugar content,sweet taste and high quality, easy to be dried. Its maturing period is extremely late, which is 15 days later than the fine strain " Jiuyuewu" (late maturing strain) , so it possesses special significance for prolonging the supply of fresh fruit and processing period. Its asexual descendants have high stability of heredity. The zymographic analysis of peroxidase isozyme showed that, it is different from " Youtanben" which has similarity of leaf-form and fruit shape. "Lidongben" was identified as a new fine strain.