In this study, the cyclone/denuder/filter pack sampling system was used to measure the daily concentrations of water soluble inorganic compounds of fine ($D_{p}< 2.5;{mu}m$) and coarse ($D_{p}<10{mu}m$m) size fractions of aerosol and related gases at Gosan super site during ABC-EAREX 2005. The mean concentrations for $HNO_{3},;HNO_{2},;NH_{3}$, were 0.39, 0.08, and $0.29;{mu}g/m^3$. respectively. Average concentrations of sulfate, nitrate, and ammonium in $PM_{2.5}$ were 3.39, 1.06, and $1.04;{mu}g/m^3$, which occupied about $26\%$ of total $PM_{2.5}$ mass. In particular, more than half of these ionic species were found in size of less than $2.5;{mu}m$. Gas phase nitric acid concentrations have shown high correlation coefficient with $HNO_{2}$(R=0.80) and $O_{3}$(R=0.78), implying the active photochemical reactions from its precursors. Equivalent molar ratios between major ion components, $NH_{4};^{+}/nss;SO_4;^{2-},(0.83;for;PM_{2.5},;0.86;for;PM_{10})$, revealed that the existing forms of the secondary aerosols were probably $(NH_{4})_{2}SO_{4};and;(NH_{4})_{3}H;(SO_{4})_{2}$. Especially, $(NH_{4};^{+}+K^{+}+Ca^{2+}+Mg^{2+})/(NO_{3};^{-}+nss;SO_{4};^{2-}) (0.99;for;PM_{2.5},;1.05;for;PM_{10})$ indicated that some of them existed not only as $NH_{4}NO_{3}$ but also as $CaSO_{4};or;KNO_{3}$, which pointed out the probability of influences from the abundant soil components during Asian dust (AD) periods. These neutralized types of secondary aerosols showed that pollutants could be aged and transported from a distance.