Global　multilayer　and　parallel　process　optimization　method　is　proposed　based　on　the　existing　CAPP　and　other　optimization　methods　for　the　global　process　optimization　problem　of　complex　components.　The　structure　of　the　method　is　established　to　carry　out　global　and　parallel　optimization　from　process　and　operation　sequence,　machine　tool,　cutting　tool,　cutting　parameters,　selection　and　evolution,　comprehensive　evaluation　and　many　other　aspects.　Based　on　set　and　matrix,　dynamic　process　genome　and　chromosome　are　established　to　transform　complex　process　optimization　to　mathematical　operation　of　set　and　matrix.　A　comprehensive　evaluation　model　of　multi-scheme,　multi-factor,　multi-target　and　multi-constraint　is　built　by　the　method　of　delamination,　weighing,　synthesis,　abstraction,　and　normalization.　According　to　the　trait　of　process　coding,　chromosome　optimization　operator　and　dynamic　genome　optimization　operator　are　designed.　The　results　show　that　this　method　has　good　practical　effect,　and　meets　the　practical　requirements　of　complex　engineering　application.