Abstract: Since, sustainable development meets the needs of the present without compromising the ability of future generations to meet their needs that is equality and equity between generations and through examining the definition, we notice that sustainable development focuses on the temporal aspect (temporal equality), neglecting the spatial aspect. Neglecting the spatial aspect of the sustainable development process which is needed for sustainability, leads to the dual-spatial development in the present and future times where preserving a temporal developmental aspect without focusing on space will create a spatial gap in the development which in turn will lead to create different poles in the present time which will be reflected over time on the next generations causing a defect in the concept of sustainability, this called for introducing the spatial aspect as an active element in the concept of sustainability but the requirements of this dimension should not be consistent with what has been mentioned in the definition above where the concepts of balance and quality should be distinguished. Sustainable development requires equal temporal and spatial balance. The aim of this paper is to discuss the concept of sustainability and to include this concept in the mechanisms of sustainable development as an indispensable component of development. It will be a method for equality between present and future generations, both temporally and spatially.