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We propose a new method to estimate cosmological parameters using the baryonfraction of clusters of galaxies for a range of redshifts. The basic assumptionis that the baryon fraction of clusters is constant, which is a reasonableassumption when it is averaged within a Mpc scale. We find that the baryonfraction vs. redshift diagram can estimate the cosmological parameters, sincethe derived value of the baryon fraction from observations depends on theadopted value of cosmological parameters. We also discuss some points incomparing theoretical calculations with observations.Comment: 4 pages. LaTeX and 2 postscript figures. to appear in PAS

A New Method to Estimate Cosmological Parameters Using the Baryon Fraction of Clusters of Galaxies