【Objective】 To observe the change of disease class among inpatient of pediatric department in Linzi People's Hospital in order to provide the scientific basis for the health care work and pediatrics medical treatment. 【Method】 Total 28 534 inpatient records during 2001-2009 were reviewed and analysed by the SPSS13.0 software. 【Results】 The number of inpatient had increased year by year, the top five ranks in disease class were bronchopneumonia, upper respiratory tract infection, asthmatic pneumonia and acute bronchitis, virus enteritis. Bronchopneumonia was in the first place of disease class accounting for 21.61 percent of the total number of 9 years, hand-foot-mouth disease(HFMD), herpangina, asthma raised rapidly. 【Conclusions】 The disease class of hospitalized patient of pediatric dipartment have changed during 9 years. The future key work is to prevent and treat children's respiratory disease, to strengthen the prevention and management for HFMD and intensify the prevention work for children's disease.