Coated carbon PVC membrane selec-tive electrode of aconitine was preparedwith the Aconitine-tetraphenylborateion--associate complex as the electroactivematerial. The electrode showed a linearresponse to aconitine witnin [the concen-tration range 1.0×10~(-2)--5.0×10~(-6) mol/L.The limit of detection was 6.3×10~(-6)mol/L and the slope of the electrode was 57.6mV/decade. The authors established a basisand a method for the control of contentlimit of aconitine in Shen Fu Injectionwith this electrode.