Electron back-scattered diffraction (EBSD) analysis has been conducted on the bead-on-plate GMAW welding of stainless steel SUS-304 and TRIP steel. The grain size, texture evolution, misorientation distributions and CSL grain boundary of weld metal (WM), HAZ and base metal (BM) have been observed at various welding conditions. With increasing heat input, the grain size in all cases increased at weld metal. With increasing heat input, no significant textural change was observed, but the characteristics of misorientation distributions and the CSL grain boundary decreased.