As the typical representative of mixed zone of agriculture and husbandry in arid and semi-arid region,Yulin Prefecture not only has its special spatial pattern in physical geography,butalso has typical characteristics of fragile ecosystemand differentiation rule in ecology.This paperapplied the basic theory and method of landscape ecology to analyze the landscape pattern of fragile environment in this area.The driving forces of ecological differentiation in this region are also identified quantitatively.At last the differentiation dynamics of landscape ecology in the regional ecosystemare studied.