Atmospheric particles can serve as ice nuclei and affect and change the microphysical structure, formation, life span and precipitation of clouds, thus having an important impact on climate. However, the current studies on atmospheric particles in China mainly focus on the concentrations of ice nuclei and a small number of potential sources in the north of China. There are limited studies focus on the impacts of size and chemical composition on ice nuclei concentration. We used the micro-orifice uniform deposit impactor (MOUDI) to collect atmospheric particulates with different sizes in Juehua Island（JHD）in Liaoning Province and Yangmeikeng（YMK）in Shenzhen. Single particle analysis by scanning electron microscopy with energy disperse spectrometer provide size-resolved elemental composition. Freezing temperatures were measured for samples with different particle size and the concentrations of ice nucleating particles were determined. The results showed that the particles with different sizes form ice at different temperatures but no clear correlation with chemical composition. We found that the freezing temperature of atmospheric particles during sandstorm period is in general higher than that for particles during the polluted period, while in clean weather is the lowest.