In order to achieve the goal of carbon peak and carbon neutrality, a new power system with new energy as the main body should be built, and HV and EHV DC cables will become the main backbone network component of the new power grid. The focus of DC cable research is on insulating materials, but there is little research on low density polyethylene (LDPE) for insulating materials in cable industry. Four kinds of LDPE (A, B, C, D) for MV/HV cable insulation material from manufacturers home and abroad were selected in this paper. The key performance parameters were compared by means of GPC, tensile test, volume resistivity test and DC breakdown test. A is more suitable as the base resin and these results will provide experimental and data support for the localization of EHVDC cable insulation material.