Abstract: In this paper, the agrcecological regionalization of the Second Branch of 853 State Farm in Sanjiang Plain of Northeast China was studied. Based on the natural conditions of the Farm, major indiceses of the regionalization were selected through the Quantification Mathod I, which are soil types, situations of potential drought and water logging, thinkness of albic horizon and landforms. According to their relative importance, the order of these indices was determined. The special maps for each index were overlaid to determine the basic units of the regionalization. With the first important index, agro-eco-sections were made up; with the second important index, agro-eco-sections were divided into agro-eco-sites; and with the third and forth important indices, agroeco-sites were divided into agro-eco-types.

Key words: Agroecology, Agroecological regionalization, Small scale regionalization, Quantification method I, Farm ecological regionalization