Abstract: In order to promote simulation development of HVDC cross-linked polyethylene submarine cable and practical application in simulation of DC submarine cable, 24 h load cycle test was carried out in the factory for DC submarine cable, and temperature inside and outside the cable under different heating time was recorded. Finite element simulation software was used to establish the simulation model of cross-linked polyethylene submarine cable. By comparing simulation data with actual test data, combined with the actual situation, feasibility and accuracy of the simulation model were guarantee. At the same time, actual test data was calibrated with the theoretical model to avoid the measurement error caused by equipment problems. Establishment of the simulation model is conducive to reducing the development and design cycle of DC submarine cable, which can provide some theoretical support for the structure and performance design of HVDC submarine cable.