Thermal and physical properties were measured on 206 Jurassic granite samples obtained from three boreholes in the central part of Korea. Thermal conductivity(${lambda}$), thermal diffusivity(${alpha}$), and specific heat(Cp) were measured in a laboratory; the average values are ${lambda}$=2.813 W/mK, ${alpha}=1.296mm^2/sec$, and Cp=0.816 J/gK, respectively. In addition, porosity(${phi}$), and dry and saturated density(${ ho}$) were measured in the laboratory; the average values are ${phi}$=0.01, ${ ho}(dry)=2.662g/cm^3$ and ${ ho}(saturated)=2.67g/cm^3$, respectively. Thermal diffusivity of 10 granite samples were measured with increasing temperature from $25^{circ}C$ to $200^{circ}C$. In this study, we found that thermal diffusivity at $200^{circ}C$ is about 30% lower than thermal diffusivity at $25^{circ}C$. In correlation analysis, thermal conductivity increases with increasing thermal diffusivity. However, thermal conductivity does not show good correlation with porosity and density. Consequently, we know that thermal conductivity of granite would be more influenced by mineral composition than by porosity. We also derived ${ ho}=-2.393{ imes}{phi}+2.705$ from density and porosity data. XRD and XRF analysis were performed to investigate effects of mineral and chemical composition on thermal conductivity. From those results, we found that thermal conductivity increases with increasing quartz and $SiO_2$, and decreases with increasing albite and $Al_2O_3$. Regression analysis using those mineral and chemical composition were carried out ; we found $K=0.0294V_{Quartz}+1.93$ for quartz, $K=0.237W_{SiO_2}-14.09$ for $SiO_2$, and $K=0.053W_{SiO_2}-0.476W_{Al_2O_3}+6.52$ for $SiO_2$ and $Al_2O_3$. Specific gravities were measured on 10 granite samples in the laboratory. The measured specific gravity depends on chemical compositions of granite. Therefore, specific gravity can be estimated by the felsic-mafic index(F) that is calculated from chemical composition. The estimated specific gravity ranges from 2.643 to 2.658. The average relative error between measured and estimated specific gravities is 0.677%.