The actual rough land surface is simulated with the exponential type distribution rough surface, the wideband forward electromagnetic scattering from rough land surface under UWB Gaussian pulse electromagnetic wave incidence is studied using FDTD. The curves of forward electromagnetic scattering coefficient varied with frequency are obtained by numerical calculation, and compared with result under harmonic field source. The forward electromagnetic scattering coefficient varying with frequency is analyzed under the difference of the correlation length and the rootmeansquare of rough land height fluctuation, the moisture capacity of soil, the incidence angle. The characteristics of the wideband forward electromagnetic scattering from rough land surface are obtained. The numerical results show that the influence of various parameters on the forward electromagnetic scattering coefficient is obvious. Moreover, forward scattering coefficient with the changes of the incident polarization modes is also significantly different.