Abstract: To enhance performance of chlorinated polyethylene (CM)/ethylene-propylene-diene rubber (EPDM) blend insulating compounds (a bbreviated as insulating compounds),the effects of addition method and dosage of zinc methacrylate (ZDMA),amount of peroxide,on vulcanization characteristics,processing performance,and physical mechanical properties of insulating compounds were investigated.Results showed that in dicumyl peroxide vulcanization system,ZDMA had a higher vulcanization efficiency compared to commonly used crosslinking agents and had a significant impact on mechanical properties of vulcanized rubber.When the dosage of ZDMA was 4 parts and the molar ratio of zinc oxide (ZnO) to methyl methacrylate (MMA) was 0.8,physical mechanical properties and processing performance of in-situ synthesized insulating compounds were optimal;when the dosage of ZDMA exceeds 5 parts,insulating compounds were prone to mold sticking,affecting processing performance.The research could provide reference for production and preparation of high-performance insulating cable compounds.