Abstract:The technical requirements about the laser employed in laser-acoustic remote sensing are put forward,and design principle of the laser is presented.The technical parameters is related to laser type,laser pulse energy,laser pulse duration,leading and focusing of light etc.The design ideas are related to special unstable resonator,precise discharge chamber,Fitch pulsed voltage generator,telescopic focus system etc.The application shows that the pulsed CO2 laser developed according to the above-mentioned design ideas can meet the demands of laser-acoustic remote sensing technique practically.