Complete Lie algebras with maximal-rank nilpotent radicals are constructed
by using the representation theory of complex semisimple Lie algebras. A st
ructure theorem and an isomorphism theorem for this kind of complete Lie al
gebras are obtained. As an application of these theorems, the complete Lie
algebras with abelian nilpotont radicals are classified. At last, it is pro
ved that there exists no complete Lie algebra whose radical is a nilpotent
Lie algebra with maximal rank.