Pulsed power technology is widely used in scientific research, military, medicine, industry, and so on. Pulsed discharge circuit, as the main research object of pulsed power technology, is characterized by high voltage, high current and high power. Inductance is one of the main concerns of pulsed discharge circuit, and a method is provided by the Computer Simulation Technology(CST) to calculate circuit inductance rapidly. In this paper, theoretical formula of wire inductance is derived based on magnetic field distribution between wires, the influence of the wire radius and the distance between wires on the inductance are analyzed. And then, iterative method of solving circuit inductance with current waveform of pulsed discharge circuit is introduced. Inductance of different circuits is calculated by means of CST finally. Comparing the inductance calculated by iterative method with that by using CST, a conclusion is drawn that CST can be utilized to analyze the pulsed discharge circuit.