"Circuit" is a specialty electrical very important foundation for the professional class, not only for subsequent courses provide a strong theoretical basis, Circuit for the analysis of various methods, with node voltage method most commonly used, But really wanted to use these methods to solve practical problems, some of the more complicated calculation of the circuit, using artificial relatively difficult to calculate, especially in the more complex circuits, the equation of a few more cases, quite cumbersome manual solution is not only time-consuming and prone to Some need for the introduction of computer-aided analysis and Qiu subject to the relevant sources of the "circuit" teaching every three chapters VI on the node voltage for the basic principle, detailing how to use MATLAB programming method and powerful matrix function of complex circuits into resistance OK analysis and calculation, but included solitary voltage source such as a special Through this method, the resistivity can complex circuit analysis and the calculation is very fast, convenient and more to the application of good teaching practice, so that students from the complex circuit analysis and calculations to extricate themselves, also for circuit analysis provides an effective auxiliary