Abstract: Radio interference experimental method based on corona cage has been widely used at home and abroad, in which calibration of the results is one of the most important task of radio interference test. The single-point single-pulse corona current simulation experiment could consider the relationship between single-point pulse excitation and the response of test circuit. What is more, the single-point pulse excitation current could be observed in the simulation experiment, which is the foundation of calibration experiment. This paper presented a simulation experiment scheme for measurement of corona current in AC corona cage. In the condition of single-point pulse excitation, this paper measured the current responses in two common radio interference’s measurement approaches by simulating the propagation characteristics of single-point corona pulse in corona cage. Considering the corona onset along the whole line evenly, this paper extended the experiment result of single-point corona discharge at different points to the total corona current along the whole conductor approximately. In this case, the test calibration factor of corona cage experiment was obtained. The experiment results are in good agreement with the simulation results with an error of 1.8% for the capacitance side with coupling capacitance case. The results also reveal that the signals which are measured at capacitance side in the experiment with coupling capacitance have the highest amplitude, from which the measurement accuracy may benefit.