The effects of peroxide vulcanization system and sulphur vulcanization system commonly used in ethylene propylene diene monomer （EPDM） insulation on the types and content of volatiles are studied by headspace gas chromatography-mass spectrometry and thermogravimetric method.The results show that the main volatiles of dicumyl peroxide （DCP） are phenylpropene，acetophenone and 2-phenyl-2-propanol；the main volatiles of 1，3-bis （tert-butyl peroxide isopropyl） benzene （BIPB） are acetone、tert-butanol and 1，3-diacetylbenzene；the main volatiles of 2，5-dimethyl-2，5-tert-butyl peroxyhexane （DBPH） are acetone，tert-butanol，2-methyl-2-methoxypropane and 2，5-dimethyl-2，5-hexanediol.The analysis of vulcanization characteristics of different peroxide systems shows that the dosage of BIPB is the least when the degree of vulcanization is equal to DCP. Compared with DCP and DBPH systems，the content of volatiles of BIPB simple vulcanization system is the lowest when pre-baked at 80 ℃.The analysis of the content of volatiles of peroxide vulcanization systems and sulfur vulcanization system shows that the volatiles content of sulfur/tetramethylthiuram disulfide/2-mercaptobenzothiazole （S/TMTD/M） full formula system is significantly lower than that of other three peroxide systems when pre-baked at 80 ℃，and the weight loss rate of pre-baked for 100 h is 31.50% lower than that of DCP system.The difference of vulcanization mechanism between peroxide and sulfur systems and the difference of vulcanization agent dosage are the main factors affecting the content and types of volatiles emission in EPDM insulation.