Based on conventional observational data, MICAPS data and NECP/NCAR Reanalysis data, together with the Gaussian simulation method, snow enhancement operation conditions on 10 November 2012 by the ground based silver iodide (AgI) generator over Mountain Damao of Tangxian were analyzed. The result showed that the weather condition is cold vortex system moving from southwest to northeast. According to Pasquill stability classification, the atmospheric stratification is neutral during the operation process. The Gaussian simulation results showed that the effective concentration of AgI can diffuse up to 3.0 km. Moreover, the atmosphere is in the updraft from the surface to 3.2 km through the operation procedure. The atmospheric temperature at the height of the generator outlet is 1.0℃ by calculation. The cloud base height in winter by manual observation is between 2.5-3.0 km. Therefore, it is concluded that the position of operation site is appropriate and the operating conditions are suitable to deliver the AgI catalyst to the cloud as well.