  It is well-known that the coordinator polynomials of the classical root
lattice of type $A_n$ and those of type $C_n$ are real-rooted. They can be
obtained, either by the Aissen-Schoenberg-Whitney theorem, or from their
recurrence relations. In this paper, we develop a trigonometric substitution
approach which can be used to establish the real-rootedness of coordinator
polynomials of type $D_n$. We also find the coordinator polynomials of type
$B_n$ are not real-rooted in general. As a conclusion, we obtain that all
coordinator polynomials of Weyl group lattices are log-concave.
