The airtightness of building is considered to be an important subject in terms of problems caused by infiltration(exfiltration) such as heating and cooling energy, stack effect, and condensation. However, the study on airtightness have been rarely presented in Korea compared to other countries, nor are there no measurement standards and evaluation methods for building airtightness and relative regulations. In this paper, we examined measurement standards from aboard and tested the measurement conditions varying pressurization and depressurization method, points, and measuring range by using blower door. And then we compared the results of the airtightness performance according to the test conditions.