Abstract: This paper describes the design and test results of an liner transformer driver(LTD) stage prototype and its multi-gap switch. This stage consists of 20 storage capacitors(100 kV/20 nF) that are arranged in 10 identical bricks locating evenly around the axis of the stage. Each brick contains two capacitors, a multi-gap switch, and the output connector that transfer the energy to the resistive load. The outer diameter of the stage is about 1.5 m, at a thickness of 20 cm. The load current was measured by B-dot probe. The magnetic core was premagnetized before each shot. At the charge voltage of ±90 kV, the stage can deliver 102.2 kA fast pulse with a FWHM of 133 ns into a 1.1 Ω resistive load. The experimental results show that the LTD stage has the capability of fast pulse output.