Applying　automatic　aerodynamic　optimization　method　of　3D　cascade,　the　first　stage　nozzle　of　E3turbine　was　optimized　for　the　maximization　of　the　total　pressure　coefficient　by　constraining　the　mass　flow　rate　and　total　pressure　ratio.　The　total　pressure　coefficient　of　the　optimum　design　has　0.8%　higher　than　that　of　reference　design.　The　optimal　design　blade　shows　a　better　aerodynamic　performance　than　that　of　reference　design.　The　result　demonstrates　that　the　method　has　good　performance　and　is　adapted　to　the　aerodynamic　optimization.