Wire wound resistor is made by winding resistance wire. The resistor is made by winding high resistance alloy wire on the insulation frame. The outside is coated with heat resistant glaze insulating layer or insulating paint. Wire-wound resistance has low temperature coefficient, high precision resistance value, good stability, heat resistance and corrosion resistance, mainly used for precision high-power resistance, the disadvantage is that the high frequency performance is poor, the time constant is large.