Based on the raw of moisture absorption under humid environment in hothumid area, the balance method was adopted to measure the moisture absorption and desorption curve of thermal insulation glazed hollow bead motar in the natural condition. And wind tunnel hothumid climatic was adopted to measure its moisture content of quality equilibrium. And then guarded hot plate apparatus was employed to measure and analyze its thermal conductivity in moisture equilibrium condition. It is found that : 1) the moisture content of quality equilibrium of thermal insulation glazed hollow bead motar under humid climate in southern area is about 3.55%; 2) under the moisture equilibrium condition, the correction factor for thermal conductivity of thermal insulation glazed hollow bead motar is from 1.04 to 1.11 and with the mean of 1.08, and it is recommended to be 1.10 considering the complexity of moisture absorption during the process of building energy efficiency design for practical projects.