Based on the application background of laser imaging radar,the paper mainly researches the technology of gate viewing imaging laser radar. Firstly,through the discussion of the principle of gated imaging laser radar,the simulation scheme of the imaging system is designed. Secondly,each section of the imaging system has been researched,and then the system related technical indicators can be obtained. Thirdly,according to the actual engineering design,the simulation system is built by LabVIEW,including several modules such as atmosphere module,object module,noise module,laser transmitting module,laser receiving module,data processing module and image display module. Finally,the simulation system is integrated on the basis of each module,and then the simulation results can be acquired including the different range results and different model imaging results. And at the range of 10 km,the imaging range resolution can reach 1.5 m. The actual range gated imaging experiment result proves that the simulation system is practical.