In the past studies, kao and ho(8) examined the performance of an R chart and found the R chart is robust to non-normality; lin and chou(10-13) had presented the performances of the adaptive control charts under non-normality, and lin and chou(10) found the VP x chart detects small shifts in the process mean faster than the standard x chart and its performances are not significantly different et al.(6) had discussed the principle of tukey's control chart and shown performance in monitoring autocorrelation data, but borckardt et al.(6) had not shown the performance to monitor short run and non-normal process.