Error analysis of the QZ algorithm for Solving fhe eigenvalue of a matrix pencil of the type λB-A is ginen in the paper The paper is made up of two parts In the first part we estimated the number of transformation of QZ algorithm.In the second one the formula of estimate of error is given.

Since the Problem of analysing the stability of a linear regulatory system c-anbe transformeal into the problem of solving the eigenvalues of a matrix. pencil of the type λB-A, it is suggested in this paper to solve the eigenvalue problem by the QZ method A computer program is proposed, which gives not only the eige-nvalues but also the matries that transform the matrix pencil into upper triangular form.