  We classify all the pairs of a commutative associative algebra with an
identity element and its finite-dimensional commutative locally-finite
derivation subalgebra such that the commutative associative algebra is
derivation-simple with respect to the derivation subalgebra over an
algebraically closed field with characteristic 0. Such pairs are the
fundamental ingredients for constructing generalized simple Lie algebras of
Cartan type. Moreover, we determine the isomorphic classes of the generalized
simple Lie algebras of Witt Type. The structure space of these algebras is
given explicitly.
