Evaluation of the suitability for urban land construction is a fundamental work in urban planning, the core of which is to rationally allocate the limited land resource. In this paper, based on the suitability assessment of arable land and developed land, we proposed three programs for the development of Dandong, including the program of priority for economic development, the program of priority for environmental protection, and the program of harmonious development. With the aid of choosing proper indicators, we established the assessment system of landscape ecological quality, composed of landscape stability and landscape disturbance. Through the evaluation of landscape ecological quality under these three programs, we made the optimization among them. The result showed that, under the program of priority for economic development, the city suffered the highest level of landscape disturbance and the lowest landscape stability, which lead to the lowest landscape ecological quality; in addition, under the program of priority for ecological protection, the city acquired the highest landscape stability and moderate landscape disturbance, which caused moderate landscape ecological quality; and under the program of harmonious development, the city got the highest landscape ecological quality with the lowest landscape disturbance and the moderate landscape stability, and therefore, the program of harmonious development should be better selected as the preferred plan for the spatial arrangement of the city.