Abstract: For the characteristics of wavelength and output power, discharge initiated repetitively pulsed HF/DF laser has become the hotspot in mid-infrared laser research field. The design and performance of a closed cycle, repetitively pulsed HF/DF laser is described. The homogeneous glow discharge is formed with UV pre-ionization and a transverse discharge structure. With the discharge characteristics in SF6/C2H6 gas mixture and the output characteristics of laser pulse are investigated and the repetitively discharge stability and gas circulation of laser device are researched. The energy depositing and extracting is achieved efficiently. A maximal running frequency of 50 Hz is obtained and it works stably. Under these conditions, the laser average power is 28 W and the peak power is 5.6 MW with a 100 ns pulse duration.