Generally, the temperature had great influence on the photopolymerization kinetics. However, few attentions were paid to the photopolymerization induced at low temperature. In this study, the solid-state system of 1, 6-hexanediol diacrylate (HDDA)/2-hydroxyl-2-methyl-1- phenyl-propane-1-one (1173) was photopolymerized at low temperature, the near infrared spectroscopy (NIR) and electron spin resonance (ESR) were employed to monitor the photopolymerization kinetics and the post-curing reaction of this system. Although the solid-state 1, 6-hexanediol diacrylate could be photoinitiated by 1173, the double bond conversion was low. The post-curing reaction could improve the double bond conversion. And the free radical was still alive after 4 h when light turned off. The photopolymerization kinetics was greatly affected by polymerization temperature. Increasing the curing temperatures caused the increase of the double bond conversion. The optimum concentration of 1173 was 0.4% for reaching high rate of polymerization and double bond conversion. However, the excessive photoinitiator decreased the rate of polymerization and double bond conversion.