The purpose of this study is to investigate the static stability of postural sway and compare it with dynamic stability by practical experiments. It can help the selection of appropriate personnel for highly exposed tasks and reduce fall risks and injuries. For static stability, index of COG% is defined regarding anthropometric specifications including height, BOS width and length and sway angles. Therefore, tabular guidelines can be developed so that balance status for each operator can be anticipated. In terms of dynamic stability, maximum Lyapanov exponents are calculated for time series data collected from gait analyzer tests and a written code in Matlab. The results reveal acceptable correlation between index of static and dynamic stability and hence can provide useful information for ergonomic concerns.