  This article considers the classification of matrix superpotentials that
corresponds to exactly solvable systems of Schrodinger equations.
Superpotentials of the following form are considered: $W_k = kQ + P +
\frac1kR$, where $k$ --- parameter, $P, Q$ and $R$ --- hermitian matrices, that
depend on a variable $x$. The list of three-dimensional matrix superpotentials
is presented explicitly.
