We propose a new method for the estimation of the accuracy of star positions and proper motions in astrometric catalogues based on the comparison of the star positions in catalogue a under investigation and the HIPPARCOS catalogue in various epochs but for a standard equinox. In this case the comparison results are represented as a curve. On the abscissa the years of comparison are plotted. An amount of the stars compared are plotted as ordinates expressed in percent of the total number of the compared stars in both catalogues, for which coordinate differences "catalogue minus HIPPARCOS" are more than a given value. Our results of the comparison for a number of catalogues are given. A statistic data analysis is carried out.