The straton knocked-out diagram is investigated more strictly using the Dyson representation, to clarify: whether the scaling property can indeed be derived from this mechanism and, if so, whether the straton mass is required to be small, and what are the definite criterions for the largeness of v and q2. It is shown that, for large values of v, the straton knocked-out diagram does lead to a scaling property, but the primary result is W1 = vf1(x) and w2 = f2(x), which differs from that of Bjorken. Only by assuming the knocked-out diagram dominance (for deep inelastic scattering) and using the gauge condition, can W1 and W2 be suppressed, thus obtaining the Bjorken scaling. Furthermore, the derivation of scaling merely requires v to be large (according to some definite criterions), but places no restriction on q2. The straton mass M is also not required to be smaller than the nucleon mass. Theoretically, for an arbitrary M, the scaling property can always be derived, provided v is sufficiently large.