In this paper we reported the experimental results of the erbium glass minilaser. Under free runing regime, we studied the influences of the reflection coefficients of the couple output mirror, the gasses pressure of the pump lamp, and the total capacitance of a storage bank on the output energy. By using a lithium niobate electrooptic switch, we gained giant pulses output of 8 mJ energy. And laser output pulses of 12 mJ energy and 80 ns duration was obtained by using a prism Q switching.