Abstract: A boundary layer wind tunnel is installed in Technical Research Institute Mitsui construction, in order to reseach in wind load evolution of structures, wind environment around tall building, and wind-induced vibration.The boundary layer wind tunnel is open-circuit type .Test section of this wind tunnel is2.0m in height, 2.6m in width20 .0m in length.Wind velocity is able to vary from0.5m/s to28.0m/s.This paper outlines the characteristics and performance of this new wind tunnel .