In　order　to　locate　the　line　where　single　pole　grounding　or　pole　to　pole　short　circuit　fault　has　occurred　in　a　DC　distribution　network　quickly,　a　location　scheme　is　proposed　and　it　is　on　the　based　of　the　Cos-similarity　of　current　integrals.　The　DC　bus　current　was　transformed　with　fast　Fourier　firstly,　then　energy　entropy　of　the　transform　was　calculated,　and　it　was　used　as　the　fault　detection　criterion.　The　fault　location　algorithm　was　activated　when　the　fault　detection　criterion　was　satisfied,　and　then　integral　calculation　of　the　currents　before　and　after　the　fault　at　both　ends　of　all　DC　distribution　line　were　carried　out.　Then　the　Cos-similarity　of　current　integrals　were　calculated.　Location　of　the　fault　line　and　selection　of　pole　were　according　to　the　comparison　of　the　calculation　results.Simulation　results　show　that　the　scheme　can　locate　the　faults　quickly　and　accurately　in　both　of　single　pole　grounding　and　pole　to　pole　short　circuit,　which　lays　a　good　foundation　for　subsequent　fault　processing.　©　2022　Editorial　Department　of　Electric　Machines　and　Control.　All　rights　reserved.