An experimental study was carried out to investigate the dynamic mechanical properties of three different particulates, perlite, CaCO₄ and CaCO₃ filled polypropylene(pp) by Visocelastic Spectrometer. The storage modulus of acrylic acid (AA) treated particulates filled pp was higher than that of untreated particulates filled pp, while value of tan f peak of the former was smaller than that of the latter at low temperature (below lO℃) and inverse phenomenon was observed at high temperature. Frequency dispersion over frequency range from 0.1Hz to 100Hz was measured at various temperature and master curve for the storage modules as a function of reduced frequency was plotted.