Cross-linked polyethylene (XLPE) is widely used in the field of cable insulation due to its excellent dielectric and physical and chemical properties. During the service of the cable,space charges accumulate inside the cable insulation,which can cause electric field distortion in severe cases,leading to cable breakdown accidents. Especially for DC XLPE cables,the accumulation and influence of space charge cannot be ignored. Aiming at the space charge accumulation effect generated in DC XLPE cable insulation,the current academic circles mainly adopt methods such as blending modification,polymer segment grafting polar groups,nano-doping modification and preparation of high-purity insulating materials. The modified DC XLPE cable insulation has an improved suppression effect on space charge generation. The suppression methods of space charge in the above-mentioned DC XLPE cable insulation are described in a review,and their suppression principles and corresponding inhibitory effect are introduced. Then,the advantages and disadvantages of different space charge suppression methods are compared and summarized. Finally,the future research and development of space charge suppression methods in DC XLPE cable insulation are prospected.