Abstract: According to the agroclimatic suitability, we carry on the agroclimatic regi-onalization of Hainan Island. Establishing two agroclimatic models by means of the extension principle of fuzzy, we can obtain the resource index which can reflect whether the agroclimatic resource is good, the efficiency index eluci-dating the coordinative degree between the resources and the efficiency utilization rate explaining resources latent power. By using the indices as the factors for regionalization, Hainan Island is divided into six agroclimatic regions by the methods of fuzzy dusting analysis and fuzzy similar priority ratio.