Security of cultivated land resources is the basis for cultivated land protection and national food se-curity. Bayan County as an important base for marketable grain production in the black soil zone of Songnen High Plains was selected as research region. Natural

economic

social and ecological indices were incorpo-rated to establish an evaluation index system in this study. The method of optimal combination was applied to establish index weights

and the method of synthetic index was used to quantitatively evaluate the opera-tion status of the security of cultivated land rescaurces in Bayan County from 2000 to 2009. In addition

prin-cipal component analysis was conducted tq analyze the driving forces. Introducing Cubic curve

the model of security changes of cultivated land resom

was was estabished with nonlinear regression analysis to validate the secure values of cultivated land resources and the eontrlbution of driving forces. The results show that the cultivated land security status of the study area differed over time it is less secure in 2000

extremely unse-cure from 2001 to 9

003

less secure from 2004 to 2005

intermediately secure in 2006

and relatively secure from 2007 to 2009. According to the anialysis

the development of technology

economy

and society

the natural disturbance forces

and the ecologicat influence were the main driving forces for the security changes. A significant cubic curve relation ship was found hetweea the cultivated land resource security and these three kinds of driving forces

reflecting high reasonability arid applicability of the model established in this study.