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The Journal of the Royal Society of Thailand Vol. 41 No. 3 July-September 2016 104 Abstract Mango Planting in Hainan Island, People’s Republic of China Saichol Ketsa Fellow of the Academy of Science , The Royal Society of Thailand The author attended the 9 th International Mango Symposium held in Hainan Island, Sanya, People’s Republic of China during 8-12 April 2013. The host took the participants to visit the National Extension Center for Mango Scientific and Technological Innovation and a farmer’s mango orchard located in the Hainan Island. Interestingly the owner of this mango orchard has planted mango trees by high density together with hard pruning and application of paclobutrazol to stimulate mango flowering. This enables off-season mango with a higher price, while mango growers in Thailand plant mango trees conventionally without hard pruning but still apply paclobutrazol to stimulate mango flowering. High density of mango planting and application of paclobutrazol have both advantages and disadvantages. Detail in mango planting in the Hainan Island will be discussed. Keywords: mango, high density planting, paclobutrazol, pruning, flowering การปลูกมะม่วงที่เกาะไหหล� ำ ประเทศสาธารณรัฐประชาชนจีน