Due　to　the　diversity　of　resources　and　different　management　requirements,　Cloud　management　is　faced　with　great　challenges　in　complexity　and　difficulty.　For　constructing　a　management　system　to　satisfy　a　specific　management　requirement,　a　redevelopment　solution　based　on　existing　system　is　usually　more　practicable　than　developing　the　system　from　scratch.　However,　the　difficulty　and　workload　of　redevelopment　are　very　high.　In　this　paper,　we　present　a　runtime　model　based　approach　to　managing　diverse　Cloud　resources.　First,　we　construct　the　runtime　model　of　each　kind　of　Cloud　resources.　Second,　we　construct　the　composite　runtime　model　of　all　managed　resources　through　model　merge.　Third,　we　make　Cloud　management　meet　personalized　requirements　through　model　transformation　from　the　composite　model　to　the　customized　models.　Finally,　all　the　management　tasks　can　be　carried　out　through　executing　operating　programs　on　the　customized　model.　The　feasibility　and　efficiency　of　the　approach　are　validated　through　a　real　case　study.　©　2013　Springer-Verlag.