This chapter investigates the stability of concrete diaphragm walls, vital for urban civil engineering projects, under varying soil types and loading conditions. Through detailed analysis of different surcharge loads and wall heights, the study identifies key failure mechanisms and proposes strategic interventions such as relief shelves and shear keys to mitigate instability. The findings highlight the significant impact of water table fluctuations on wall stability, necessitating proportion adjustments in the design components. Additionally, the research reveals that as wall height increases, the factor of safety decreases, indicating the need for specific design modifications. Effective solutions like extending heel slabs and widening stems are shown to enhance wall stability. This research contributes to safer and more durable urban infrastructure by providing practical strategies for improving the stability of concrete diaphragm walls.