  The nonlocal symmetry of the generalized fifth order KdV equation (FOKdV) is
first obtained by using the related Lax pair and then localized in a new
enlarged system by introducing some new variables. On this basis, new Backlund
transformation is obtained through Lie's first theorem. Furthermore, the
general form of Lie point symmetry for the enlarged FOKdV system is found and
new interaction solutions for the FOKdV equation are explored by using
classical symmetry reduction method.
