Abstract: In order to be better use and protection of cultivated land resources and find out the dominant factors of cultivated land changes in the west of Jilin Province, based on the cultivated land of county (city) from 2001 to 2009, land use dynamic range and relative change rate and increase and decrease characteristics of cultivated land area was analyzed. The driving forces of cultivated land variation were studied through the method of the principle component analysis. The results showed that: from 2001 to 2009, the growth of cultivated land population was 0.37% , the dynamic range and relative rate change of the cultivated were greater, the dynamic range of cultivated was 0.74% , the relative rate of cultivated was 2.03% in Zhenlai County. The three important driving forces included social and economic development, population growth, development of agriculture and livestock farming. It was found that the quantities of cultivated land were increased over the past nine years, contradiction between people and land was not outstanding, and regional difference between regions was obvious.