Abstract: Safe wintering was a key for the survival of semi-tropical and tropical fruit trees in Fujian.Therefore,the extreme low temperature came to an indispensable and dominant index in the fine regional planning of crops safe wintering.Effects of topography to extreme low temperature were obvious.In order to make finer regional planning,different characteristics of mountain topography and climate were concluded,division indexes to different aspects and various temperature inversion backgrounds were also identified,based on the research of "Climate characters of Fujian Upland",the research of"Rational use of agroclimatic resources in semi-tropical upland in China",and other relative researches.

Key words: Topography climate, Division index, Fine regional planning