To establish a technological system of Lagerstroemia indica reflowing regulation, six years old L. indica cultivated with root-controlling containers was used as the test material to study the effects of different pruning intensity and topdressing on its second blossom. The results showed that pruning and topdressing could promote the reflowering of L. indica. The most suitable treatment was pruning 4/5 of the new shoots after the first flower, applying 150-180 g AKANG compound fertilizer at the root once two weeks, spraying 500 times solution of Peters No.2 10-30-20 on the leaf once five days after bud emergence, and applying two kinds of fertilizer respectively. Full-bloom days, length of flower branch and number of inflorescences in this treatment were significantly higher than those in other treatments, the florescence days were at a higher level. During the period of flower control, 1000 times solution of acetamiprid and 800 times solution of Triadimefon were sprayed once two weeks, which could effectively control aphid, powdery mildew and soot disease of L. indica and ensure its normal flower bud differentiation.