Abstract: he main production area of Chinese millet (accounting for 97%of the total sowing area)was divided into 5 districts(namely,spring millet with very early-maturing, early-maturing, mid-maturing, late- maturing and summer millet districts) and 11 subdistricts in accordance with the national standards of maturity periods for millet varieties,the light-temperature ecological types for millet varieties and the load values of the comprehensive effect factors of 14 adaptability-related ecological factors in 160 test sites. The ecological characters and the" characters of the varieties were analysed and the existent problems were pointed out for each district. The division was characterised by:l. The use of climatic and geographic factors, millet ecological characters, especially, uniform mature period standards, so as to link up the areas under the same ecological conditions regardless of the administrative region; 2 .Theinitial invention of the national division, for grain crops, characterised by a multitude of test sites and factors, the load values of the comprehensive effect factors,and high typicality; 3. The solution of the problems of ambiguity in the division of some main millei. production area, such as Chengcle, Chaoyang, Chifeng, Tieling, and Jinzhou.

Key words: Millet, China, Ecological divisio