Abstract：Suspended atmospheric microplastics （SAMPs） have been identified as one of the important sources of pollution in environmental units such as water and soil， and they pose some potential ecological risks. To understand the differences of SAMPs in different environments， this study used Harbin New area as the study area and collected air from six different underlying surfaces in the region using a portable atmospheric particulate sampler （Airmetrics， USA）. After stereomicroscopic observation and Fourier infrared spectrometer （VERTEX 80） analysis， the widespread presence of SAMPs was confirmed and data information on the abundance distribution， type， particle size， color and chemical composition of SAMPs was derived. The analysis indicated the following results. Fragmented SAMPs were the dominant type in cultivated land， and the dominant type in other substrates was fibrous. The particle size composition structure of SAMPs was similar in different underlying surfaces， and SAMPs with size range from 1 to 35 μm accounted for 80.71% of the total， among which the percentage of small size SAMPs in woodland， grassland and water area was larger than other underlying surfaces， and no SAMPs with particle size larger than 100 μm were found. Transparent microplastics were the main color type of SAMPs in each subsurface， among which colored microplastics were more in construction land and water SAMPs， which were directly related to human activities. The polymer composition of SAMPs of each subsurface included PP， PET， PE， PS， and PVC， among which the quantitative percentage of PE was larger in cultivated land and water. Preliminary calculations by the ecological risk assessment model showed that the ecological risk of each subsurface was low， and the degree of human concentration was found to be positively related to the risk index. SAMPs are closely related to human life， and this paper provides a scientific basis for further understanding the spatial distribution， transport and risk of urban SAMPs.