<b>The Rank of Risk Factors Affecting Time Delay and Cost Overrun of Building Constructions Projects in Yangon</b> In Yangon City, Myanmar, most of the building construction projects fail to meet their cost and time constraints, which will lead to low return on investment. The purpose of this paper is to understand risk management of building construction and the study area is Yangon. This study illustrates that how to manage risks in building construction to become a successful project with best possible outcome by reducing risks that delay the project. The study was conducted through a questionnaire survey administered to 39 construction projects and 148 professionals in Yangon for finding risk rating and prioritization of risk. Risk prioritization was done by Technique for Order of Preference by Similarity to Ideal Solution TOPSIS . Construction building projects, Project risk management, Qualitative analysis, Group technique for order preference by similarity to ideal solution and sensitivity analysis GTOPSIS 1458-1462 Issue-4 Volume-4 Khin Su Yi | Kyaw Kyaw