  We systematically search intersecting D-brane models, which just realize the
Standard Model chiral matter contents and gauge symmetry. We construct new
classes of non-supersymmetric Standard Model-like models. We also study gauge
coupling constants of these models. The tree level gauge coupling is a function
of compactification moduli, string scale, string coupling and winding number of
D-branes. By tuning them, we examine whether the models can explain the
experimental values of gauge couplings. As a result, we find that the string
scale should be greater than $10^{14-15}$GeV if the compactification scale and
the string scale are the same order.
