Abstract: To study the enhancing effect on the disease-resistance of longan by genetic modification,twononphotosynthetic ferredoxins from the plant were transferred to Oncdiumthrough Agrobacterium tumefaciens strain EHA105 for cultivation on a culture medium containing 5mg·L-1hygromycin.As compared to the plants in the wild,the Fd3 transgenic plants showed a significantly higher resistance to soft rot disease improving the resistance grading from highly sensitive(Di=100)to moderate(Di=27.5).In addition,the survival rate of the transplants also increased significantly from 79.3%to 95.7%.