The profiles of the heating temperature in three water vat temperatures (55, 66 and 77$^{circ}C$) and the cooling temperature under the average ambient temperature of 3$^{circ}C$ in 4 and 10cm depths from surface at the center of veneer bolts length showed similar patterns for Japanese larch (Larix leptolepis). Dahurian larch (Larix gmelinei) and Radiata pine (Pinus radiata). The difference of these core temperatures of 10cm depth from surface varied proportionally with the increase of vat temperatures. The average heating time based on final core temperature of 6$^{circ}C$ lower than vat temperature required about 14.5 hours in vat temperature of 55$^{circ}C$ and 13.5 hours in vat temperature of 66and 77$^{circ}C$. Each internal temperature of 4 and 10cm depths from surface started to decrease from the beginning of cooling and after about two hours.