A quadratic line complex, or a quadratic complex, is by definition a set of lines in a projective space Pn (n = 3, in our case) which satisfy a given quadratic equation. A quadratic complex can also be considered as a pencil of quadrics. Hence, it has a well defined Segre symbol. It is a classical fact that lines of a given complex through any point p ∈P3 form in general a quadratic cone. The points such that theses cones break up into two planes form a surface, the Singular Surface of the complex. The objective of this work is, for a fixed Segre symbol, to construct the Moduli space of quadratic complex, the Moduli space of corresponding singular surfaces and to study the relation between them.Um complexo de retas quadrático, ou simplesmente ...