Due to the actual application requirement for Unsymmetrical Dimethylhydrazine（UDMH） degradation， low temperature plasma（LTP） was employed as an efficient proposal. An application device based on dielectric barrier discharge（DBD） was designed and developed with microsecond pulse power supply and six coaxial reaction tubes as the key components to generate LTP for UDMH degradation. The effects on the discharge power and power factor of power parameters were explored under different frequencies and pulse widths. Under optimal conditions， the removal efficiency of UDMH and the energy consumption were analyzed. The power factor of the experimental device increases with the increase of frequency， and has a maximum value between 2 μs and 10 μs， which is near 6 μs. The optimal parameters for power supply is the input voltage of 200 V， frequency of 1000 Hz and pulse width of 6 ms. The removal efficiency of 43.5 and 264.5 mg·L^-1 UDMH reached 99.9% and 93.8%， and the energy consumption was 0.51 and 0.18 kWh·g^-1. Therefore， the coaxial reaction tube with quartz glass and water film as barrier medium and air as the working gas can generate large-area LTP through DBD， which can degrade UDMH efficiently with low energy consumption， indicating that LTP technology has good practical value for UDMH wastewater treatment.