Abstract:With the extension of environmental meteorological services, pollen forecast has been implemented in a lot of province. Because grad of pollen prediction has no uniform standard and the results of service have been influenced at present. In order to standardize pollen concentration prediction objectively, the seasonal change character of pollen was analyzed based on the data of twenty nine provin ce of China. A correlation between the pollen concentration and the pollen anaph ylaxis was statistically analyzed based on the data of pollen observations achie ved in 2001 2005, Tianjin and in 1994-1995, Wuhan, and the data of patients who are sensitive to the pollen. According to pollen sensitized intensity of differen t kind of plant, including woody plant and herbaceous plant, five grades of poll en concentration were classified: low, lower, medium, higher and high, respectiv ely. The classification shows a good consistency between the pollen concentratio nand the pollen anaphylaxis.Although the pollen concentration does not accurately describe the change of incidence of pollinosis, it can indicate evolution trend . The grades are convenient and practical to the operation service.