The　growth　of　columnar　grain　during　the　solidification　of　the　1Cr18Ni9Ti　stainless　steel　weld　metal　for　different　welding　parameters　is　simulated　using　the　grain　boundary　evolution　(GBE)　modeling　method.　The　shape　and　the　size　of　the　weld　pool　under　different　welding　parameters　are　calculated　using　PHOENICS　software.　The　simulated　results　show　that　the　growing　direction　of　the　columnar　grains　is　dependent　on　the　shape　of　the　weld　pool.　The　straight　and　short　grains　tend　to　grow　in　direction　perpendicular　to　the　weld　centerline　if　the　length/width　(L/W)　of　the　weld　pool　is　large　and　the　curving　and　long　grains　grow　toward　the　welding　direction　if　the　L/W　ratio　is　small.　The　experimental　results　are　found　to　be　in　good　qualitative　agreement　with　the　simulated　results.