Conventional　resonance　calculation　methods　are　developed　based　on　the　equivalence　theory　which　are　only　appropriate　for　the　simple　regular　geometry.　It　is　not　capable　of　dealing　resonance　calculation　for　complicated　geometries.　In　this　paper,　the　subgroup　resonance　calculation　method　is　developed　based　on　the　subgroup　theory　and　subgroup　neutron　transport　equation.　Resonance　calculation　is　realized　for　2D　arbitrary　geometry　by　introducing　sophisticated　transport　solver.　Therefore　the　spatially　dependent　resonance　multi-group　cross-sections　can　be　obtained　directly　by　subgroup　transport　calculation.　A　computation　code　SUGAR　is　developed　according　to　this　method　and　verified　by　numerical　samples.　Good　accuracy　is　observed　to　prove　this　method　and　code　is　very　promising　for　complicate　resonance　calculation　in　two　dimensional　arbitrary　geometries.