Abstract: Under background of industry integration，national modern agriculture demonstration garden is a closed-loop ecological system of agricultural technology research，agricultural industry development，agricultural industry chain extension，and agricultural product marketing.It is an important measure for adjustment of agricultural structure，transformation and upgrading of industry，transformation of agricultural technology achievements，and increase of farmers′ income.Based on experience of Taicang city and Huzhou city，development of Hainan national modern agricultural demonstration garden was researched，and some countermeasures to speed up development were put forward.