The　effect　of　flux-cored　ingredients　and　welding　parameters　on　porosity　sensitivity　of　ENiCrMo3T0-4　flux-cored　wires　was　investigated　by　stereomicroscope　and　optimum　design　software.　Results　show　that　porosity　sensitivity　is　reduced　with　the　ratio　of　SiO2/ZrO2,　TiO2/ZrO2,　and　(TiO2+ZrO2+SiO2)/MnO　decreasing　in　flux-cored　ingredients.　The　shielding　gas　flow　rate　has　little　influence　on　number　of　needle　holes　on　weld　surface.　Wormhole　in　weld　surface　is　formed　when　the　flow　rate　is　too　low.　The　number　of　needle　holes　and　porosity　sensitivity　of　weld　metal　are　the　lowest　when　welding　voltage　is　25　V,　welding　current　160　A　and　electrode　stick-out　20　mm.　Porosity　sensitivity　of　weld　metal　can　be　reduced　by　enlarging　solid-liquid　phase　temperature　interval　and　hydrogen　solubility　in　high　temperature　slag.　©　2018,　Northwest　Institute　for　Nonferrous　Metal　Research.　Published　by　Elsevier　BV.　All　rights　reserved.