Abstract: The effects of welding parameters on room temperature mechanical properties of T92/S30432 dissimilar welded joint were investigated and the optimized welding parameters were obtained. The results reveal that welding interpass temperature,weld layers,filler metals and groove angles had little effects on strength of the joint,but low interpass temperature and more weld layers improved the impact toughness of heat-affected zone (HAZ) at T92 steel side. Compared with ERNiCr-3 filler metal,the impact energy of HAZ at T92 steel side with ERNiCrMo-3 filler metal decreased due to a higher ferrite content. In addition,the impact toughness firstly increased and then decreased with increasing the groove angels and the highest impact toughness was obtained at 35°. Moreover,the best strength and toughness were obtained at post-weld heat treatment(PWHT) temperature of 760 ℃. Hence,for the aim of obtaining the better welding parameters for T92/S30432 steels,ERNiCr-3 filler metal,a low interpass temperature,strict controlling weld layer thickness and (PWHT) treatment temperature of 760 ℃ should be employed.