To quantify the effects of 30 years soil and water conservation on the regional ecological security in Ganzhou City,the 17 indices of ecological security assessment were constructed using frequency statistics and expert consultation method based on soil erosion status of study area.The ecological security of Ganzhou City was evaluated by the pressure state response model.The results showed that:(1)The ecological security of Ganzhou City obviously improved in the past 30 years.However,the level of ecological security declined in some area.The integrated level of ecological security was only grade in Ganzhou City and needed further improvement.(2)Negative correlation between ecological security and soil and water losses was found in Ganzhou City.With 30 years comprehensive conservation of soil and water,the correlation was weakening,and the influences of soil erosion and water losson the ecological security were decreased.Therefore,soil and water conservation become one of the most important methods to improve ecological environment in Ganzhou City.