The Blue - Green Infrastructure (BGI) represents an innovative and integrative approach in landscape architecture, combining water and vegetation systems to create a more firmly established, resilient, and multi - functional urban environment. This study explores the role of BGI in promoting sustainable development, emphasizing its capacity to manage stormwater, enhance biodiversity, and improve urban microclimates. Through architecture design interventions such as green roofs, rain gardens, vertical greening systems, and permeable pavements, BGI transforms conventional grey infrastructure into dynamic ecological networks that support environmental and social benefits. By introducing a few case studies from urban contexts and urban campuses, the findings highlight the significance of integrating ecological processes and social values into landscape architecture design, reinforcing BGI as a cornerstone of sustainable and livable urban futures. Implementing the Blue - Green Infrastructure approach creates more inclusive cities by integrating people with nature as well as facilitating climate adaptation.