The CH molecular beam was generated by DC pulsed discharging methane seeded in helium in the supersonic expansion to study the generation and features of CH molecular beams. The variation of the CH spectral intensity with the different time delay of discharging relative to valve opening was recorded experimentally. It is found that the most intense signal is achieved when the time delay is about 460 μs. The dependence of the spectral intensity of CH on the ratio of methane was studied at total pressure fixed at 3 atm and discharge voltage fixed at -4 kV. A theoretical model was proposed, by which the calculation agrees well with experimental results. The stable discharging process and relatively strong charging intensity result in intense CH radical beam, with a pressure ratio of CH4 to helium about 1∶99. Under the above ratio, the emission spectra of the (0,0) band in the A2Δ-X2Π system was detected and analyzed, and the vibration and rotational temperatures were determined to be about 4575 K and 2455 K, respectively. The CH number was estimated to be about 1013～1014 per pulse in this experimental condition.