The (Ag-O) chains grown along the [001] direction on Ag(110) disappeared by the reaction with Cu atoms at room temperature, and new one-dimensional chains grew in the [110] direction. The STM images at different bias potentials suggest the growth of (Cu-O) chains in the [110] direction on the Ag(110) surface. The (Cu-O) chains on the Ag(110) surface disappeared by heating to 470 K, but they reappeared by exposing to O-2 at room temperature.