[Objective] A preliminary exploration on the quantitative evaluation of land ecological security was made in Chongqing City in order to provide support and theoretical reference for land ecological security research and the ecological environment construction.[Methods] Based on the conceptual framework of driving force-pressure-state-impact-response(DPSIR), land ecological security evaluation index system was established. Grey correlation model was used to give weights for the land ecological security index to evaluate land ecological security of Chongqing City from 1997 to 2012.[Results] The land ecological security showed a gradual downward trend, as it was a sensitive situation during 1997-1998, 2003-2009 and 2012, a safe situation during 1999-2002, and a insecurity situation during 2010-2011. The land ecological security index of driving force and pressure fluctuated slightly and showed a downward trend. The state index and response index showed an overall growth trend, while the impact safety index showed a fluctuated change.[Conclusion] The adjustment of industrial structure, environmental protection, and increase of capital investment and the improvement of technology, the improvement of agricultural production, increase of the forest coverage and enhancement of the response of land ecological security, is the fundamental guarantee of land ecological security in Chongqing City. The evaluation model and index system in the present study is reliable and can be used in land ecological security evaluation.