This article argues the problems of ecological strategies in the planning of pedestrian street system, and the main contents of ecological strategies under the concept of low-carbon strategy. From a whole environmental ecosystem to an urban pedestrian ecosystem, some strategies of pedestrian zone are studied. The paper also discusses the contents of ecological strategies in the ecological design of pedestrian street system, the major controllable factor in the ecological strategies, the pedestrian street ecosystem and the urban spaces, the urban life etc. In addition to these, the article studies the composition of pedestrian street ecosystem, the relationship among the urban ecosystem and the pedestrian ecosystem, the planning and design integrated ecology, the method of interdisciplinary working. System theory is involved in this paper to discuss relevant questions.