  In this paper, we consider the Kirchhoff plate equation with delay terms on
the boundary control are added (see system \eqref{p5-2.1} below). we give some
instability examples of system \eqref{p5-2.1} for some choices of delays.
Finally, we prove its well-posedness, strong stability without any geometric
condition and exponential stability under a multiplier geometric control
condition.
