The continuing increase of urban population will cause the increase of the pressure on the city environment. Some environmental problems faced in cities indicate that urban carrying capacity has exceeded. The condition of the environment will degrade if the load pressure on the environment affected by human activities has exceeded the environment carrying capacity. To achieve the sustainable city, it is urgency to develop city plan based on its carrying capacity. In this study, environmental threshold method has been designed to indicate final ecological limits for sustainable development. Ultimate Environmental Thresholds (UETs) method applies the thresholds concept to the definition of carrying capacity. The analysis methods used to achieve the purpose of model development is the description analysis, the quantitative analysis, the scoring analysis and the spatial analysis. The analysis of the research indicate these thresholds considered as the final boundary to possible location of development, or the final limit of what natural environment can take without irreversible damage. The result being the planning contribution towards defining carrying capacity which indicate what preferred and dominant function should be promoted and where is ecologically safe would become especially relevant. In summary, an overall adaptation of Ultimate Environmental Thresholds provides a simple approach that can be useful tool in defining city’s carrying capacity.