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We confirm the difference of chemical abundance between stars with andwithout exoplanet, as well as present the relation between chemical abundancesand the physical properties of exoplanets such as planetary mass and semi-majoraxis of planetary orbit. We have obtained the spectra of 52 G-type stars withBOES (BOAO Echelle Spectrograph) and carried out the abundance analysis for 12elements of Na, Mg, Al, Si, Ca, Sc, Ti, V, Cr, Mn, Co, and Ni. We first havefound that the [Mn/Fe] ratios of planet-host stars are higher than those ofcomparisons in the whole metallicity range, and in metal-poor stars of [Fe/H]$<$ -0.4, the abundance difference have been larger than in metal-rich samples,especially for the elements of Mg, Al, Sc, Ti, V, and Co. When examined therelation between planet properties and metallicities of planet-host stars, wehave observed that planet-host stars with low-metallicity tend to bear severallow-mass planets ($< M_J$) instead of a massive gas-giant planet.

Abundances of Refractory Elements for G-type Stars with Extrasolar Planets