  The B-meson light-cone wavefunctions, $\Psi_{\pm}(\omega,z^2)$, are
investigated up to the next-to-leading order in Fock state expansion in the
heavy quark limit. In order to know the transverse momentum dependence of the
B-meson wavefunctions with 3-particle Fock states' contributions, we make use
of the relations between 2- and 3- particle wavefunctions derived from the QCD
equations of motion and the heavy quark symmetry, especially two constraints
derived from the gauge field equation of motion are employed. Our results show
that the use of gluon equation of motion can give a constraint on the
transverse momentum dependence $\chi(\omega,\mathbf{k}_\perp)$ of the B-meson
wavefunctions, whose distribution tends to be a hyperbola-like curve under the
condition $0<c_1<1$, which is quite different from the WW type wavefunctions,
whose transverse momentum dependence $\chi^{WW}(\omega,\mathbf{k}_\perp)$ is
merely a delta function. Based on the derived results, we propose a simple
model for the B-meson wavefunctions with 3-particle Fock states' contributions.
