  Within the t-t'-J model, the doping dependence of charge dynamics in
electron-doped cuprates is studied. The conductivity spectrum shows a pseudogap
structure with a low-energy peak appearing at $\omega\sim 0$ and an rather
sharp midinfrared peak appearing around $\omega\sim 0.3\mid t\mid$, and the
resistivity exhibits a crossover from the high temperature metallic-like to low
temperature insulating-like behavior in the relatively low doped regime, and a
metallic-like behavior in the relatively high doped regime, in qualitative
agreement with experiments. Our results also show that these unusual behaviors
of the charge dynamics is intriguingly related to the magnetic correlation in
the system.
