According to the mechanics of capillary discharge by electron collision excitation regimes in Ne-like Ar, a capillary discharge device was designed on a Marx generator whose maximum output voltage is only 300 kV. The test was systematically proceed. At capillary charge filled with Ar gas, output current of 38 kA, current pulse rising edge of 40ns was attained. At present, the experiment study of fluorescence spectra was developing on capillary discharge in Ne-like Ar.