Certain airborne allergic pollen can cause respiratory tract disease or skin disease to some people. This paper conducts a quantative analysis on year round airborne pollen collected by using Cour’s interceptor from three experimental stations in Beijing, Yucheng and Taoyuan and identifies principal airborne allergic pollen types in these areas and the occurrence time of maximum pollen concentration in a year. Based on concentration, proportion, and radius of allergic pollen as well as volume of air inhaled by adults per week averagely, the amount of allergic pollen inhaled within a week by adults during the maximum pollinating period can be further calculated so as to provide quantitative data for prevention and control of allergic pollen disease. Research results indicated that the most important allergic pollen in Beijing and Yucheng of North China Plain includes that of Artemisia and Gramineae plants, belonging to summer-autumn type of allergic pollen. Pollen of Artemisia plants in Beijing area is found to be distributed in April to October, and peak occurs in August to September whereas peak of Gramineae pollen is in September. Since grain crops grow more extensively in Yucheng district, peak of Gramineae plant pollen occurs in June. The principal allergic pollen in Taoyuan locating in subtropical climatic zone consists of spring type Cunninghamia, summer-autumn type Canabis and Artemisia. Of which the amount of Cunninghamia pollen is very great, distributing mainly in March, the week observed the highest pollen concentration of Canabis and Artemisia plants is in September.