Taking a specific project as an example， the control strategy and protection configuration of the step controlled shunt reactor（SCSR） are presented. Starting from basic structure of SCSR， the composition of the various parts and their respective functions are introduced， and its working method and principle in theory are explained， with corresponding formula for calculating the reactive power capacity as well. Furthermore， as viewed from the performance requirement for control system， the operation principle，implementation for the design scheme and control strategy of the control system are detailed. And the method and procedure for capacity switching as well as the advantages of the control method are highlighted. This is followed by configuration of the protection system， with focus on the wiring， principle and protection method for valve protection， circuit breaker protection and transient protection. Finally， the performance of the control and protection system is illustrated with the system test of Xindu 500 kV controlled shunt reactor pilot project.