In　this　paper,　deformation　and　stress　of　casting　shell　and　the　resin　prototype　pattern　are　analyzed,　getting　the　criterion　of　non-crack.　And　solid　prototype　pattern　which　is　in　the　diameter　of　30mm　and　hollow　prototype　pattern　which　is　in　the　diameter　of　30mm　with　thickness　of　1mm　are　prepared,　then　coated　and　sanded,　baked　to　get　the　casting　shell.　The　results　show　that　criterion　of　non-crack　of　casting　shell　is　based　on　cross　sectional　ratio　M　of　casting　shell,　and　hollow　prototype　pattern　is　more　reasonable.　When　charging　temperature　is　80　to　100　degrees　C,　heating　rate　is　150　degrees　C/h,　the　prototype　pattern　is　heated　to　950　degrees　C　for　30min,　then　the　integrated　casting　shell　is　obtained.