为探讨提高龙眼花穗发育质量及座果产量的技术途径 ,采用正交设计的方法 ,开展防止龙眼花穗冲梢的药物试验。结果表明 ,防止龙眼花穗冲梢的药物处理最佳时期为花穗主轴伸长 6～9cm、花穗小叶处于展叶期 ;试验所设的 9个药物处理中 ,以处理 4为最好 ,即当花穗伸长 6～ 9cm时 ,树冠喷施 30 0 mg· L-1乙烯利 +30 0 mg· L-1青鲜素 +34 0 mg· L-1比久 +2 0 0 mg· L-1多效唑 +0 .1%硼砂 +0 .2 %硫酸锌的混合药液 ,枝梢抽生纯花穗的成穗率最高 ,达 77.3% ,该处理花穗、果穗性状的综合表现最好 In order to explore the technical ways to improve the quality of longan flower spike and fruit yield, the orthogonal design method was used to carry out the drug test to prevent longan flower spike. The results showed that the best period of drug treatment to prevent longan spike was 6 ~ 9cm of spike of flower spike and leaflet of spikelet of flower was in leaf-blossoming stage. Of the 9 drugs tested, 4 was the best, That is, when the spike elongation was 6 ~ 9 cm, the canopy was sprayed with 30 0 mg · L-1 ethephon + 300 mg · L-1 cyanobacteria + 34 0 mg · L-1 for more than 200 mg · L-1 L-1 paclobutrazone +0 .1% borax +0.2% zinc sulfate mixed solution, shoots sprouting pure ear spike rate reached the highest, reaching 77.3%, the processing of spikes, ear characteristics of the most comprehensive performance it is good