This　article　proposes　a　new　model　for　concurrent　Lean-Kaizen　based　on　the　Lean　production　thinking.　According　to　the　concept　and　application　scenarios　of　value　stream　mapping　and　DMAIC　(Define,　Measure,　Analyze,　Improve,　and　Control),　we　proposed　an　integrated　VSM-DMAIC　by　adopting　their　advantages　and　avoiding　their　disadvantages.　The　VSM-DMAIC　model　is　applied　to　tackle　the　production　problems　on　production　line.　Value　stream　mapping　is　used　to　identify　the　production　problems　during　production　processes　by　waste　identification.　Then,　the　production　problems　are　clustered　into　different　production　problem　sets　according　to　the　changed　types　of　production　resources　while　solving　production　problems.　The　data　envelopment　analysis　method　is　used　to　rank　the　production　problems　by　input-output　ratio,　and　the　most　important　production　problem　in　each　set　can　be　the　concurrent　Lean-Kaizen.　DMAIC　provides　a　structured　problem-solving　method　for　production　problems.　Finally,　the　production　problems　and　production　problem　sets　will　be　reassessed　for　the　next　concurrent　Lean-Kaizen.　A　case　study　of　an　air-conditioner　assembly　line　verified　the　feasibility　and　efficiency　of　the　proposed　VSM-DMAIC　model,　which　can　be　used　to　improve　the　economic　benefits　and　decrease　the　waste　of　production　line.