Recently, we know that stack effect in high-rise buildings causes various problems in winter such as elevator malfunctions, difficulties in opening and closing. Many studies have been done on the problems caused by the stack effect in office buildings, and several guidelines and solutions have been proposed by drawings reviews and airtight constructions. However, stack effect problems have occurred in existing buildings because they were not applied at the design stage and the construction one. To reduce the problems caused by stack effect after construction, we need to understand the overall airflows in the buildings through the pressure profile analysis. This paper deals with field measurement of pressure distributions and analysis of stack-induced problems in the existing high-rise office building.