简介:Apreconditioningmethodforthefiniteelementstiffnessmatrixisgiveninthispaper.Thetriangulationisrefinedinasubregion;thepreconditioningprocessiscomposedofresolutionoftworegularsubproblems;theconditionnumberofthepreconditionedmatrixisO(1+logH/h),whereHandharemeshsizesoftheunrefinedandlocalrefinedtriangulationsrespectively.