Chapter 1 focuses on the Introduction of operational amplifier and the general definition in order to get into the comprehensive schematics and structure so you can get to know much better and helps you prepare well for the next steps of other sorts of basic Op-amps. Chapter 2 concentrates on the base of amplifiers function and the behavior of operational amplifiers in a basic way in order to smooth the path of prominent and core Operational amplifiers. Chapter 3 shows the key schematic, structure, application and mathematic tools to analyze and simulate of operational amplifier out put and signal process, the way to implement in real system. Chapter 4 scrutinizes the role of operational amplifier in circuits the importance of applying Op-amps in oscillation circuits. Chapter 5 brings a wide range of examples to digest easier most of the problems for involving more and more with various operational amplifiers circuits.