Abstract: In order to solve problems of block overlap of frequency bands in cable fault ranging method based on empirical mode decomposition and effect of residual white noise in the one based on ensemble empirical mode decomposition, an online cable fault ranging method by doubleend traveling wave for underground distribution network was proposed which was based on complementary ensemble empirical mode decomposition (CEEMD). The method extracts intrinsic mode function of line model components of doubleend fault traveling wave by CEEMD, and uses singularity detection principle based on instantaneous frequency mutation and modulus maxima to demarcate the wave head, so as to realize fault location. A 6 kV underground distribution network model was built in PSCAD/EMTDC software which was based on frequency characteristic of cable line. The simulation result shows the method has high ranging precision, and the max ranging error is no more than 4%.