In order to realize the recognition and detection of remote material, a non-contact pulse gated Raman detection system was designed and established, by using the high energy density of strong pulsed laser(~106 W) enhanced the Raman scattering signal from the substances detected, a large aperture lens system was used to improve Raman light collection efficiency, while using synchronous delay system to control the open and integral time of ICCD, the background interference light and fluorescence were removed to improve the signal-to-noise ratio, thus increasing the Raman spectrum detection distance. The influence of different lens aperture was studied, the clear Raman spectra of sulfur elements and water were also obtained at a detection distance of 950 mm.