When the lifetime data from the series system are masked, we consider the reliability estimation of exponentiated-Weibull distribution based on different masking level. We consider a series system of two independent component which follows exponentiated- Weibull distribution. Maximum Likelihood Estimators (mle) of the unknown parameters are derived for different masking level. Finally, numerical simulation studies are done to obtain the values of the mles. We also obtain the percentile errors of the estimators
