The terahertz (THz) laser pumped by all-metal radio frequency (RF) waveguide CO2 laser is designed and researched.Its working gas is CH3OH .The pulsed THz laser output is obtained with the pump of P9(36) CO2 pulsed laser(9.69 μm).The THz laser waveform and pulse repetition frequency (PRF) for the pumped laser and THz laser are measured in experiment.The relationship between laser intensity and working gas pressure is also given.The PRF can be up to 5 kHz for the pumped laser detected by HgCdTe detector with high bandwidth.The THz laser is measured by pyroelectric detector and the measured waveform is distorted and the maximum PRF is only 1 kHz due to the limitation of the detector.The relationship between THz laser intensity and working gas pressure is also studied and the best working pressure is about 10 Pa.The designed THz laser has all-metal structure,which needs no water cooling.It has the advantages of simple structure and small size,which are helpful for further researches.