The paper represents the root locus fields approach to the problem of parametric synthesis of uncertain control systems meeting the given robust quality requirements. The described method consists in location of the system characteristic equations family roots within the given domain Q in the complex plane. It can be attained by inscription of the root locus field level lines into the domain Q. Considered is the case of linear coefficients correlation. The approach offered is peculiar for making it possible to consider the domains of arbitrary shape both convex and concave described analytically by algebraic curves.