It mainly includes the selection of withstand voltage value, attention to the temperature coefficient, high frequency characteristics and other parameters of high-voltage capacitor, and reasonable determination of the capacity and error of high-voltage capacitor.

1. Selection of withstand voltage value 
  In order to ensure the normal operation of high-voltage electrolytic capacitor, the withstand value of the selected high-voltage electrolytic capacitor should not only be greater than the actual working voltage, but also leave enough room. Generally, the high-voltage electrolytic capacitor with withstand voltage value more than twice the actual working voltage is selected.

3. Reasonable determination of capacity and error of high voltage electrolytic capacitor

     The capacity value of high voltage electrolytic capacitor must be selected according to the specified nominal value. There are many error levels of high-voltage capacitors. In low-frequency coupling, decoupling, power filter and other circuits, high-voltage capacitors can be selected ± 5%、 ± 10%、 ± But in the oscillation circuit, delay circuit and tone control circuit, the precision of high voltage electrolytic capacitor is slightly higher; In all kinds of filters and networks, high precision high voltage electrolytic capacitors are required.