The fundamental functions of the control and scanning system in the Beijing FEL spectrometer are reported. The magnetic field analysis of the slow deflection coil and the specification of the microsecond pulse generator are introduced. 叙述了北京FEL谱仪中的控制与扫描系统的基本功能以及用于偏转电子束的慢偏转线圈的磁场分析及其微秒脉冲电流源性能。