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With the acceleration of urbanization, the ecological relationship between suburban lake and city has become severely strained. Ecological environment of lake, which is the basis of the development of lake tourism, has been threatened by urban sprawl in an increasing trend. Liangzi Lake is taken as an example in this paper, with hope to establish the active mode of protection to resist urban sprawl, and to preserve harmonious relations between the city and suburban lake. Three types of progressive distance of the lake and the surrounding towns is given on the basis of lake ecological ring structure in this paper: sustainable development of cities and lakes in the distance far, ecological harmony, the city closer and closer to the lake, the lake ecological environment impact, city connected with the lake, threatening the lake ecosystem security. Liangzi lake is classified in the second category above, the water quality of Grade Ino longer exists, the threat of urbanization is one of the main factors. The lakes and surrounding towns relationship needs to be improved, or lake water quality will continue to deteriorate. Therefore, the paper propose three measures to resist the erosion of the city on the lake: the establishment of ecological barrier, driven by the interests of protection mechanisms, environmental remediation of the lake and surrounding towns. In order to establish defensive model of tourism exploration against the urbanization process, maintain harmonious ecological relationships of the urban and suburban lakes.