Wavelets　expansion　method　can　simulate　the　functions　oscillating　violently.　It　has　been　applied　to　simulate　the　violently　variety　of　the　angular　flux,　and　has　obtained　satisfactory　results.　Neutron　spectrum　has　violent　oscillations　within　the　resonant　energy　range.　This　paper　introduces　a　method　to　discretize　the　energy　variable　of　neutron　transport　equation　by　coupling　the　multi-group　method　and　wavelets　expansion　method,　which　simulates　the　energy-dependent　angular　flux　with　wavelets　scaling　function　within　the　resonant　energy　range　and　uses　multi-group　method　within　fast　and　thermal　neutron　energy　ranges.　The　preliminary　calculation　results　indicate　that　this　method　can　obtain　the　accurate　k-inf,　as　well　as　determine　the　fine-structure　energy　distribution　of　the　angular　flux,　which　is　significant　to　resonance　self-shielding　calculation.