采用微小颗粒粒径和电荷同时测量装置以及高压方波电源和纳秒（ｎｓ）高压窄脉冲电源，对用于静电除尘预荷电的负电晕放电荷电器进行了实验研究和理论分析，探讨了其荷电性能和规律，并提出了适用于预荷电器的新的理论荷电计算方法。 The experimental study and theoretical analysis of the negative corona discharge charger for electrostatic precipitator pre-charge are carried out with the device of simultaneous measurement of fine particle size and charge, high voltage square wave power supply and nanosecond (ns) high voltage narrow pulse power supply. Its charge performance and regularity, and put forward a new theoretical charge calculation method suitable for pre-chargers.