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Gypsum board is used, in general, as interior finish material in building, aimed at functional efficiency, i.e.: fire resistance, insulation, sound barrier and so on. However, there is little research on substantial transformation of gypsum board under fire exposure necessary to settle thermal properties such as coefficient of thermal conductivity, heat transfer expansion, and specific heat . In this study, fire tested specimens were analyzed by using scanning electron microscope (SEM) and X-ray diffraction (XRD) in order to grasp the relationship between these substance transformation and fire performance test. Test data obtained from DTA and TG test, XRD and SEM observation showed he transformation of bassanite or anhydrite around 135 C could be effective for suppressing temperature-rise in drywall.