|In this study, effects of preheating temperatures on ΔC*, ΔH*, ΔE*, moisture absorption rate, thickness change and spring-back ratio were investigated. Poplar wood specimens after being coated with paraffin on the transverse sections, soaked in water and placed were preheated for 12 min at 90, 120, 150, 180°C or 210°C, respectively, and then they were compressed 5 mm at the same temperature. The results showed that increasing the preheating temperature resulted in an increase in ΔC*, ΔH* and ΔE* and they increased dramatically when preheating temperature was above 150°C. This indicated that 150°C was a key temperature point for color change. Meanwhile, increases in the preheating temperature led to a gradual lowering of moisture absorption rate, thickness change and spring-back ratio and they decreased dramatically when the preheating temperature was above 150°C. It could be concluded that 150°C was also a key temperature point for the spring-back. Furthermore, there was negative liner correlation between the ΔE* and spring-back ratio. The higher the ΔE*, the lower the spring-back ratio was.