Kuming has enjoyed the last 50 years rapid urban development and continued to grow towards international city. The auto motorized vehicles has become very ubiquitous in the modern city like Kunming. However, due to the poor transportation networks and infrastructures, the city is suffering from the overcrowding and congestion problem which have reduced the city's efficiency and restricted the city growing towards a sustainable, industrialized, urbanized and international city. Kunming urban planning agency has proposed subway system in dealing with city overcrowding problems and allowing a more accessible city movements which would enhance living condition and promote city dissertation will be focusing on the main objective of the "Kunming Subway Construction" by analyzing the possible social welfare and economic benefits of this system and discussing the feasibility of the this new proposal. in the conclusion, suggestions and recommendations will also be proposed regarding the issue