  The heavy charged gauge bosons were proposed in the theories beyond standard
model. We explore the discovery potential for $W'\to t\bar{b}$ with top quark
semi-leptonic decay at the LHC. We concentrate on the new physics signal search
with the deviation from the standard model prediction if the resonance peak of
$W'$ can not be observed directly. The events of signal with two jets plus one
charged lepton and missing energy are simulated together with the dominant
standard model backgrounds. In this paper, it is found that suitable cuts on
the kinematic observables can effectively suppress the standard model
backgrounds, so that it is possible to search for $W'$ signal at the LHC with
its mass less than 6.6 TeV.
