  In the paper the notion of {\em Rauzy scheme} is introduced. From Rauzy graph
Rauzy Scheme can be obtaining by uniting sequence of vertices of ingoing and
outgoing degree 1 by arches. This notion is a tool to describe Rauzy graph
behavior. For morphic superword we prove periodicity of Rauzy schemes. This is
generalization of fact that quadratic irrationals have periodic chain
fractions.
