Objective:To study performed of develop a mice model of allergic diseases induced by crude extractings from populus pollen.Methods: A total of 60 BALB/c mice were divided randomly into there groups:normal control group,Albumin Egg(OVA) group and populus pollen model group with 20 in each.Mices were repeatedly sensitized by intraperitoneal injections of OVA or crude populus pollen extract every 5 d for four doses.Five days after the last sensitization,mices were repeatedly challenged by once daily antigen from 21-25 d.The changes of inflammatory cells in bronchoalveolar lavage fluid(BALF) were stained with hematoxylin and eosin(HE) to evaluate the degree of allergic inflammation.PAS staining was used to observe the secretion of airway mucus;The changes of the nasal mucosas and lungs of mice were stained with HE to evaluate the degree of allergic inflammation.And the average optical density of IL-4 and IFN-γ positive cells in lung tissue was measured by immunohistochemistry.The total IgE in the serum was also measured by enzyme-linked immunoassay(ELISA).Results: Compared with the mice in normal control group,those in OVA group and model group developed obvious allergic inflammation in the nasal mucosas and lungs,and increased airway mucus secretion.The number of inflammatory cells including eosinophil and neutrophils markedly increased in BALF smear.The average optical density of IL-4 positive cells in lung tissue was all increased in OVA group and model group compared with those in normal control group,and the average optical density of IFN-γ in lung tissue was on the contrary.The total IgE in the serum were all increased in OVA group and model group compared with those in normal control group,and the IFN-γ in the serum was significantly reduced in OVA group and model group compared with those in normal control group.Conclusion: Taken together,crude populus pollen extract can successfully induce a mice model of allergic diseases.This model is a useful tool in studying the mechanisms of allergic disease.