The 100 mg pure AgI powder was placed in a vaporization tube of an electrical heating furnace and heated to 1600℃ for gasification. Then, the gaseous AgI was burst into a 2 m3 metal container by high-pressure air, and AgI aerosols were formed after suddenly cooled afterward. AgI aerosols were sampled by natural sedimentation using the formvar stabilized with carbon support films. The results indica-ted that the aerosol composition maintains pure AgI and the size spectrum width is 0.84-34.6 nm with 2.17 nm peaking diameter. The ice nucleation efficiency of the quantitative pure AgI nano-aerosol was detected by a 15 L mixed cloud chamber, with and without fog, respectively. The preliminary results were that the efficiency of ice nucleation is little more than 1.1×1011 g-1 under the condition of -10℃ with cold fog, and 3.4×1010 g-1 without cold fog.