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The objective of this research is to provide the basic experimental data for thermal insulation design standard of buildings and for test criterion. We tested the thermal conductivity of insulation materials which was the insulation materials in domestic buildings with environmental condition change and long-time elapse. In research, we measured change of thermal conductivity with change of contained water rate by weight, test temperature change and the passage of time. the specimens of insulation materials were kept in test condition, which was influenced by the outside environment during long-time elapse test. The result of the research shows 1)the contained water rate of artificial mineral fiber insulations is higher than others, 2)thermal conductivity rises as test temperature goes up, 3)the thermal conductivity of the extruding insulations and hardened Urethane foam changes with environmental condition and time elapse. As a result, the test methods and standards for thermal conductivity properties have much room for consideration.