Land ecological security is the core of human sustainable development. Due to the rapid growth of China’s economy and the rapid advance of urbanization, the irrational use of land resources has produced a series of land ecological security problems, such as soil erosion, land salinization, land desertification and other issues. The relationship of each factor in the land ecological system is complex, but the qualitative problem of the existing evaluation method is more serious, because it cannot reflect the relationship between the index and the system. In view of that problem, matterelement model was introduced into regional land ecological security evaluation. The evaluation results show that 87.45% land of ecological security level of Da’an County is at the safety level, nevertheless, the overall ecological security level still has room for improvement. Therefore, in order to improve and enhance the level of land ecological security, and to promote the sustainable development of urban ecology, groundwater exploitation needs to be controlled and reduced, the level of coal mining needs to be reduced, vegetation coverage needs to be increased, and energy conservation awareness needs to be enhanced, and the high-polluting industries relocation or ecological management policies needs to be resolutely implemented. In the face of unchangeable natural conditions and unavoidable meteorological disasters, the relevant departments of Da’an County should take appropriate measures to control the adverse effects, caused by disasters and reduce the damage caused by artificial disturbance to the ecological environment. Matter element analysis can reveal the information of individual evaluation index. Evaluation method of land ecological security based on the matter-element model was an objective and scientific comprehensive assessment method. This study could provide a reference for the sustainable development of regional land resources.