This work concerns the phenomena in which the feedback linearization contro
l is applied to uncertain nonlinear time-delay processes. Under the I/O lin
earization algorithm, both nonlinear controllers are used to stabilize the
closed-loop system with transformed delay inputs. When the effect of input
perturbations can converge to zero or asymptotically vanish, these nonlinea
r feedback designs with only an adjustable parameter can directly improve t
he tracking performance. The simple linearizing controller can directly reg
ulate the system output at unstable operating point. Combined with deadtime
compensation the nonlinear predictive controller with the aid of appropria
te state prediction is valid for the real process in the presence of large
time delay. Finally, via computer simulation and test of control ability of
both feedback control designs the useful comparative results are presented
.