As the largest Hakka Terrace in China, the Hakka Terrace of Chongyi provides many ecological services for local people. Comprehensive evaluation of the sustainability of this terrace ecosystem will be helpful for the local government to improve the development and responsible use of its resources. The reality, potential, and the obstacles to the sustainable development of the Hakka Terrace Ecosystem of Chongyi were analyzed with the help of a comprehensive weighing function model, a coordination degree model, and a model of obstacle degree on development. The results showed that the comprehensive indexes of ecological sustainable development of this terrace system increased 2.22 times from 1990-2014; that the average annual growth rate of the comprehensive indexes of sustainable development reached 3.24%; and that the process of sustainable development can be divided into three stages, namely, the rapid stage from 1990-1994, the undulating stage from 1995-1999, and the slowdown stage from 2000-2014. In the first stage, when the comprehensive evaluation indexes of sustainable development grew rapidly with an average annual growth rate of 9.52%, the sustainable development of the Hakka Terrace Ecosystem of Chongyi occurred at a high level. In the stage of ups and downs, though the annual average rate of the comprehensive evaluation indexes was only 1.73%, the comprehensive evaluation indexes were higher than 1, compared with 1990, and thus, the situation of sustainable development of the Hakka Terrace Ecosystem of Chongyi was much better. However, as the comprehensive evaluation indexes experienced ups and downs in the interval from 1.4 to 1.5, the sustainable development of the Hakka Terrace Ecosystem of Chongyi was not stable. In the last stage, or the slow development stage, the annual growth rate of the comprehensive evaluation indexes was 2%, which was between the first two stages. During this period, the sustainable development of the Hakka Terrace Ecosystem of Chongyi was slow, but the overall trend of the sustainable development was better. The coordination degree among the indexes was greater than 0.65, suggesting that these indexes were able to develop in a coordinated manner and that the Hakka Terrace Ecosystem of Chongyi boasted great potentials for sustainable development. However, it was restricted by four monomial obstacles-service industry output, farmers' education, the Engel coefficient, and the rate of farmland affected by natural disasters, whose obstacle degree values were 0.17, 0.17, 0.15, and 0.13 respectively. While these economic figures revealed the reality of sustainable development of the Hakka Terrace Ecosystem of Chongyi, they provided sufficient data to allow the government to make sound and relevant policies.