High　frequency　diagnostic　technology　is　an　important　method　for　detecting　partial　discharge　of　high　voltage　XLPE　cables.　However,　the　traditional　high-frequency　diagnostic　technology　cannot　accurately　separate　different　types　of　partial　discharge,　and　its　ability　of　anti-noise　is　relatively　weak.　In　this　paper,　a　separation　technique　of　partial　discharge　pulse　is　proposed　based　on　fuzzy　clustering　for　XLPE　cables.　The　technique　is　discussed　in　terms　of　theoretical　analysis,　experimental　verification　and　practical　measurement.　The　validity　of　the　technique　is　verified　by　the　measured　data.