  We describe all linear operators which maps $n-1$-dimensional simplex of
idempotent measures to itself. Such operators divided to two classes: the first
class contains all $n\times n$-matrices with non-negative entries which has at
least one zero-row; the second class contains all $n\times n$-matrices with
non-negative entries which in each row and in each column has exactly one
non-zero entry. These matrices play a role of the stochastic matrices in case
of idempotent measures. For both classes of linear maps we find fixed points.
We also study the dynamical systems generated by the linear maps of the set of
idempotent measures.
