CNC technology is widely used in the manufacturing industry improving the accuracy and productivity of products. This work contains 4 chapters. Chapter 1 introduces the composition and working principle of CNC system. Chapter 2 illustrates the characteristics of NC machine tool processing technology. Chapter 3 suggests the foundation of NC programming. Chapter 4 introduces the programming instructions and application examples of CNC lathes. This book is simple and practical, so that readers can quickly grasp the content of the book immediately. This book can be used by engineering and technical personnel engaged in CNC machine tool programming and operation, and can also be used as a teaching material for undergraduate students majoring in machinery and near-machinery.