Protel DXP is a powerful EDA software developed by Altium Company, which has almost all the advantages of the current advanced circuit aided design software. This book introduces in detail the typical methods and skills of circuit schematic drawing and PCB printed circuit board design using Protel DXP integrated development environment, as well as the methods of circuit simulation and the application of signal integrity analysis tools. When explaining the functional modules of Protel DXP, we skillfully combined several typical examples in circuit design, truly combining theory with practice, and closely combining the functions of Protel DXP with specific applications, so that readers can master the main methods and skills of circuit design as soon as possible. This book is comprehensive, informative and easy to understand, especially suitable for beginners and intermediate users. Some circuit design skills in the book also have certain reference value for advanced users. This book can be used as a training material for circuit designers and board makers, and also as a reference for teachers and students of related majors in colleges and universities.