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The aim of this paper is to determine a bound of the dimension of an irreducible component of the Hilbert scheme of the moduli space of torsion-free sheaves on surfaces. Let X be a nonsingular irreducible complex surface, and let E be a vector bundle of rank n on X. We use the m-elementary transformation of E at a point 
$x \in X$ to show that there exists an embedding from the Grassmannian variety 
$\mathbb{G}(E_x,m)$ into the moduli space of torsion-free sheaves 
$\mathfrak{M}_{X,H}(n;\,c_1,c_2+m)$ which induces an injective morphism from 
$X \times M_{X,H}(n;\,c_1,c_2)$ to 
$Hilb_{\, \mathfrak{M}_{X,H}(n;\,c_1,c_2+m)}$.
