The effects of tributyl phosphite （TBP） content on the process performance，thermal stability and mechanical properties of frontal polymerization dicyclopentadiene （DCPD） resins were systematically investigated using TBP as an inhibitor.The results show that when the molar ratio of DCPD to Grubbs Ⅱ catalyst （GC2） is 10，000：1，the TBP molar ratio increases from 1 to 5，the pot life is extended from 1，876 s to 8，104 s by three times；the glass transition temperature increases from 121.2 ℃ to 134.5 ℃，an increase of 11%；the rate of frontal polymerization decreases from 7.14 cm/min to 3.96 cm/min，a decrease of 44%；the frontal temperature decreases from 203 ℃ to 173 ℃，a decrease of 15%.When the molar ratio of DCPD and TBP is same，and the molar ratio of GC2 increases from 1 to 2，the gel temperature and time of the resin system decrease dramatically，and the glass transition temperature decreases by more than 30 ℃，but the frontal polymerization rate increases by about two times.In addition，regardless of the GC2 content，the thermal decomposition temperature and mechanical properties of the frontal polymerization DCPD resin are basically unaffected by the inhibitor content.