Abstract: To disclose the heat conduction property of woody composite mat, quasi steady state method was applied to test the heat conduction coefficient (HCC) of wood fiber and rice straw particle motrice with 10 % liquid urea formaldehyde (UF) resin based on ovendry fiber or particle at room temperature in this paper. Influences of processing parameters, including designed board density (0.6, 0.7, 0.8, and 0.9 g/cm3) and mat moisture content (10 %, 15 %, 20 %, 25 %, 30 % for wood fiber mat (WFM), and 10 %, 15 %, 20 % for rice straw particle mat (RPM)), on HCC were studied. Test results showed that under above conditions: (1) HCC of WFM and RPM were 0231 5-0.523 6 W/(m〖DK〗·K） and 0.260 4-0.344 6W/（m〖DK〗·K）, respectively; (2) HCC of both mats increased with increased designed board density and/or higher mat moisture content (MC), and MC showed stronger significance on HCC of WFM than that of RPM; (3) RPM showed overwhelmingly higher HCCs than WFM with MC under 20 %.