Objective To investigate the relative risk factors of the morbidity rate of asthma in children with bronchiolitis in rural areas,and to provide clinical reference for the prevention and treatment of asthma. Methods A total of 575 cases of children with bronchiolitis were selected from January 2005 to May 2008 in Cangzhou rural areas.The investigation included 29 factors.Then,the sicked children were carried out the clinical examination and questionnaire survey from May2011 to October 2013.A total of 300 cas...