Abstract: Used trimethylolpropane triacrylate (TMPTA) to take the cross-linking agent, EVA(VA content 28%) to take the modifier and Co60-ray to take the radiation source, the effects of TMPTA, EVA and irradiation dose on the gel content and the mechanics performance of PVC cable material were Studied. When EVA content was 15Phr, gel content in PVC increased along with the TMPTA contents and irradiation dose enhances, and its mechanics performance had a positive proportion relationship with gel content. When TMPTA content was definite (12Phr), Joined EVA to be disadvantageous to the PVC cable material gel content enhancement, the mechanics performance of PVC cable material gradually drops along with the EVA content increases and did not show any relationship with gel content. This showed that TMPTA may be firstly to cross-link with EVA under irradiation condition and forms EVA cross-linked system, and the interface compatibility between PVC matrix cross-linked system and EVA cross-linked system was bad. The result of the study would be a good guidance for the selection of modifier for high property PVC cable material.