In　this　paper,　a　multichannel　energy　detection　(MED)　receiver　based　on　nonlinear　square　law　(SL)　technology　is　proposed　for　ultra-wideband　(UWB)　system.　By　using　a　group　of　band-pass　filters,　the　received　signal　processed　by　SL　device　is　separated　into　multiple　channels,　and　then　the　channel　with　serious　narrow　band　interference　(NBI)　will　be　omitted　to　improve　the　NBI　mitigation　ability　of　the　receiver.　Simulation　results　show　that　comparing　with　conventional　ED　receivers,　the　proposed　SL-MED　receiver　can　significantly　improve　the　bit-error-rate　performance　when　one　or　two　NBIs　are　present　and　even　no　NBI　presents.