A new frequency weighting method to estimate hand-arm vibration was obtained by the epidemiological method. In this study, the influence of a frequency component was first estimated by the method of multivariate analysis, then a simple form weighting curve was introduced. Compared with the present ISO 5349-1 system, the temporary weighting curve obtained better explained the relationship between rates of symptoms and vibration exposure among vibrating tool users. Although this method is based on limited data, it suggests that the current curve described in ISO 5349-1 should be changed to estimate high frequency areas higher and low frequency areas low.