  Within the t-J model, we study the electronic properties of the doped
antiferromagnet on the kagome lattice based on the framework of the
self-consistent mean-field theory. At the half-filling, the spin-liquid
ground-state energy per site of the kagome antiferromagnet is Eg/NJ=-0.859,
which is in very good agreement with the numerical estimates. Away from the
half-filling, the electron photoemission spectroscopy and density of states are
discussed, and the results indicate that there is a gap in the normal-state of
the system.
