Abstract: Five-day moving average method, climate tendency rate, grid mathematical model and ArcGIS software were used to analyze climatological data of 18 meteorological stations from 1961 to 2018 in Yiwu county, Xinjiang. Taking the number of days with daily average temperature stability ≥15 ℃ as the index of ripening type, and light temperature index ≥20 ℃ as the index of quality, the fine division of climate suitability for Hami melon planting in Yiwu county was carried out. The results showed that the planting areas of Hami melon in Yiwu county were divided into the best planting area of late maturing, the best planting area of medium maturing, the best planting area of early maturing, the second best planting area of early maturing and the unsuitable planting area. The best planting area of late maturing was mainly distributed in the alluvial inclined plain below 450 m above sea level in central Naomaohu town; The best planting area of middle maturingwas mainly distributed in the plain at 450~700 m above sea level in Naomaohu town,the best planting area of early maturating was mainly distributed in the piedmont inclined plain at 700~850 m above sea level, the second best planting area of early maturating was mainly distributed in the piedmont inclined plain and hilly area at 850~1 000 m above sea level,the unsuitable planting area was mainly distributed in the areas higher than 1 000 m above sea level.

Key words: Hami melon, climate suitability, fine regionalization, Yiwu county of Xinjiang