  We proposed a concept of LU transformation invariant operators. By using this
operator, arbitrary multi-qubit states LU transformation invariant and SLOCC
invariant could be easily obtained. And we find that presences two kinds of
invariant operators and corresponding invariants. One kind of operators yields
LU invariants and the other operators results in SLOCC invariants. For
three-qubit states, all independence LU transformation invariant are obtained.
Furthermore, by this system method, arbitrary multi-qubit states invariants can
be given.
