Urban migration has led to overcrowded cities, prompting the development of underground spaces to ease congestion and utilize land efficiently. By 2050, 68% of the world's population will live in cities. In China, urban populations have doubled in 30 years, leading to a need for innovative urban planning. Creating underground spaces can help reduce surface congestion, control urban sprawl, and repurpose land for recreational use. The paper reviews recommended practices for developing urban underground spaces, focusing on planning, function, and environmental sustainability.