  As we knew, study the perturbation theory of spectra of operator is a very
important project in mathematics physics, in particular, in quantum mechanics.
In this paper, we characterize the Fredholm perturbation for the Weyl spectrum,
essential spectrum, spectrum, left spectrum, right spectrum, lower
semi-Fredholm spectrum, upper semi-Weyl spectrum and lower semi-Weyl spectrum
of upper triangular operator matrix $M_{C}=({cc} A&C 0&B)$.
