Controlled Source means non-independent source,their voltage or current cannot exist separately and it's not real power.According to the practical experience in teaching,the controlled source circuit are summarized,the paper mainly introduces the characteristics of controlled source,the application in Controlled Source of branch current method,node voltage method,mesh current method,thevenin theorem and superposition theorem,it also introduces the handling of Controlled Source during the calculation and combined with a specific example for detailed analysis.The paper also briefly gives account of the application of controlled source circuit.