Ultrasonic tests were carried out to establish the measurement conditions. As a result, the exponential transducer with 54㎑ and elastomer cover which were not nearly influenced by surface roughness were the most suitable for diagnosis of stone cultural heritages. In addition, the correction factors for indirect measurement were calculated as 1.52 for granite, 1.58 for quartz diorite, 1.38 for gabbro, 1.62 for sandstone and 1.69 for limestone. Based on the ultrasonic measurement conditions and the calculation methode of weathering index, the weathering degree of four Korean stone cultural heritages were evaluated. As a result, Sungnyemun stone block foundation was determined as the weakest heritage in relative and absolute weathering index

Recently, infrared thermography that analyzes a blistering zone from surface temperature is widely used in stone cultural heritages. This study focused on quick detection and quantitative modeling of blistering zones. Blistering modeling for the stone cultural heritages should be carried out as following orders; aquisition of thermography image, establishment of critical temperature, monochromatic processing, extraction of vector line, mapping of blistering zone, and calculation of deterioration rate. The deterioration rate of blistering zones of Cheomseongdae observatory and Sungnyemun stone block foundation using the infrared thermography were 1.5% and 6.6%, respectively.