The present investigation of type descriptive co - relational of traverse court, had as purpose to determine the influence of the knowledge and practical of taking care of the parents y/o caretakers in the graveness of the bronchial asthma in children from 5 to 9 years with asthma of the Educational Regional Hospital of Trujillo. The study population was conformed by children's 80 parents y/o caretakers from 5 to 9 years with bronchial asthma that you/they were assisted in the emergency service in Julio's months–September of the 2009. The instruments that were used were: Test of knowledge on the bronchial asthma of the parents y/o caretakers of asthmatic children of the Dr. Rodríguez (2005); Test on you practice them of the parents y/o caretakers of children with bronchial asthma of Br. Medina and Mego (2009) and Scale of asthma classification for levels of graveness of the group GINA...