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In this work, we propose two models for contractions defined in finite dimensional Hilbert spaces.These models called matricial and universal, respectively, are constructed using the spectra and allow one to find all the contractions studied up to unitary equivalence. Resume.Dans ce travail, nous proposons deux modeles d'operateurs pour de larges classes de contractions definies dans des espaces de Hilbert de dimension finie.Ces modeles respectivement appeles matriciel et universel s'exprimenta l'aide du spectre et permettent de retrouver toutes les contractionsetudieesa uneequivalence unitaire pres.

Deux modeles pour les operateurs de contraction