Ice nucleating particle (INP) concentrations are reported for a mountain site on the north-western margin of Beijing, during winter 2017, with the newly purchased continuous flow diffusion chamber(BJ-CFDC). Atmospheric INP concentrations characteristics are analyzed with weather elements, precipitation size distribution measurement and aerosol observation. The relationship among INP concentration, and activation temperature, super saturation with respect to water, aerosol with size larger than 0.5 m are developed. The result shows that atmospheric INP has a large variation at different activation temperature. It ranges between 2.50～76.8 L-1 at -20℃ with an average of 18.347 L-1. Atmospheric INP concentration increases exponentially both with lowering temperature and increasing super saturation respect to water. The result also shows atmospheric INP has a good correlation with the concentration of aerosol particles of sizes larger than 0.5 m. With this relation, the relevance of predicted and measured INP is higher than that the relationship built with only temperature. Atmospheric INP in snow days shows a characteristic of increasing firstly and decreasing later. INP concentration increase in the beginning of snow.The strong wind in the later period of snow scavenge the aerosols and lead to reduced concentration of INP. With the first continuous flow diffusion chamber type instrument used in China, the results of this paper will not only help to study the orographic cloud and precipitation in winter of north China, but also improve the support for development of cloud model and study in weather modification.