The removals of NO x by low temperature plasma produced from gas-liquid two phase dielectric barrier discharge(DBD) were investigated, also studied the major particles information of gas-liquid two phase DBD by emission spectroscopy, and analyzed effects of peak voltage, gas residence time, gas flow rate and NO x initial concentration to the removal of NO x . The results show that OH radicals spectral intensity of gas-liquid two phase DBD is far more than plate plate electrode DBD, so it is more adapt to the removal of NO x . Increasing the peak voltage and gas residence time is good for reduction of NO x , increasing gas flow rate and NO x initial concentration have inhibitory effect on NO x removal. The results have a guiding significance on the application of NO x removal by low temperature plasma.