The　needle-like　Al11Nd3　phase　and　irregular　polygon-like　Al2Nd　phase　are　the　existing　forms　of　Nd　in　Mg-6Al　alloy　prepared　by　metal　mould　casting　method.　The　former　is　located　on　dendritic　and　grain　boundaries　while　the　latter　is　situated　within　grains　interior.　The　weight　fractions　of　Al11Nd3　and　Al2Nd　phase　both　increase　with　increase　in　the　content　of　Nd　and　the　former　is　much　more　than　the　latter.　The　solidification　path　of　Mg-6Al-xNd(x=2,　4)　alloys　experiences　several　stages　mainly　including　the　precipitation　of　Al2Nd,　the　precipitation　of　part　of　α-Mg　and　the　simultaneous　precipitation　of　Al11Nd3　and　part　of　α-Mg.　The　hot　cracking　susceptibility　increases　with　increase　in　the　content　of　Nd,　which　results　from　three　factors　as　below:　The　precipitation　of　Al11Nd3　and　Al2Nd　leads　to　the　shrinkage　of　solidification　gap　and　decreases　the　liquidity　of　surplus　liquid　phase.　The　needle-like　Al11Nd3　phase　located　in　dendritic　and　grain　boundaries　makes　it　difficult　for　the　surplus　liquid　phase　to　flow　and　feed.　It　is　easy　for　the　thermal　stress　to　occur　due　to　the　difference　in　solidification　shrinkage　rate　between　Al11Nd3　and　α-Mg.