Mechanism of the laser guided discharge was observed precisely by using high speed cameras. The following results are obtained: The radius of the metal plasma wave front varies according to the polytropic change of gases. The plasma produced by the main dischrge is found in the metal plasma produced by the laser irradiation. Both plasmas are considered to expand with the thermal energy of the main discharge. There are two types of pre-disdrarge which triggers the main discharge. The pre-discharge type I appears between the metal plasma and the anode and the type II appears at the minimum length of the anode and the cathode. The guided discharge is triggered by the pre-discharge type I and the pre-discharge type II is not observed by the camera. In the case of the misguided discharge, the pre-discharge type II triggers the main discharge when the pre-discharge type I can not trigger it and disappears.
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