Abstract: The conception,properties,and quantitative methods of ecological security of regional land resources were studied,24 indices selected to calculate the value of ecological security in 1998 and 2003 of the central district of Zaozhuang City, Shandong Province by using the ecological security models.The results indicate that the ecological security in 1998 was the first class “worst”,and in 2003 the second class “worse”,meaning that the ecological security of land resources in the central district of Zaozhuang City had been improved obviously.