With the trend of industry upgrading and the blooming of the digital technology, manufacturing technologies are becoming digitized, automated and intelligent in the world. Advanced manufacturing technologies should be imported for the manufacturing industry in Taiwan. In this way, processing technology in the industry can be increased and kept up with the world. On the other hand, product orientation and environmental issues are becoming popular. Lightweight products are drawing more and more attention, but the thin-walled workpiece is not easy for machining. Therefore, a complete set of process planning technology is needed for upgrading manufacturing capacity in Taiwan's industry. The process analysis and high machining efficiency technology of the metallic thin-walled manufacturing is introduced in this study. By analyzing the whole manufacturing system, simulating the process and predicting the process efficiency, the optimal process solutions can be decided. This systematic process planning technology can also solve problems which traditional manufacturing methods cannot break through before.