Abstract: In order to provide the theoretical basis for regulating longan perinatal period, the experiment was conducted to study the technology by using the end batch flower fruit setting of longan. Using the Shek Kip longan as test material, the author sprayed on the leaves that longan flower sporadically, studied the end batch flower pistillate ratio, fruit setting rate, mature period, the single fruit weight and soluble solids of variation curve and so on. The results showed that: the flower’s (bud) shedding rate of the test tree to stability was 60%-73%, the shedding of the law was big bud easy shedding of and small bud (the end batch flower) wasn’t easy shedding, the female ratio to improve after the end batch flower maturation, was up to 78%. The experimental results showed from 2009-2012, test tree plant yield were 42.77 kg, 42.99 kg, 58.62 kg, 66.20 kg, fruit maturity time needed to respectively extended 18, 17, 14, 16 d. Using the end batch flower fruit setting technology of longan could made fruit maturity time needed to extended 14-18 d, effective regulation of longan fruit supply period, the longan yield and quality no difference, at the same time, the end batch flower florescence climate relatively stable, the fruit setting rate was high, stable yield.