Objective To analyze the clinical pathogenic characteristics of children with co-infected pneumonia, and to provide reference for clinical diagnosis and treatment. Methods Children with co-infected pneumonia treated in the pediatrics department of the First Affiliated Hospital of Chengdu Medical College between June 2023 and May 2024 were selected. According to age, the children were divided into infants, toddlers, preschoolers, school-aged children, and adolescentsg roup. The clinical pathogenic characteristics of children with pneumonia would be analyzed. ResultsA total of 358 pediatric patients were included. Among them, there were 189 males (52.79%) and 169 females (47.21%). There was no statistically significant difference in the composition of males and females in different age groups, types of pneumonia(P>0.05). The bacteria infecting the child are mainly Haemophilus influenzae, Staphylococcus aureus, Moraxella catarrh and Streptococcus pneumoniae. Viruses in the pathogen mainly include adenovirus, influenza A, B stream, human rhinovirus and respiratory syncytial virus. Except for typical pathogens (P>0.05), the detection rates of bacteria and viruses in different age groups showed statistically significant differences (P<0.05). The detection rates of bacterial co-infections, viral co-infections, bacterial+viral infections, and co-infections involving atypical pathogens were compared among different age groups, and the differences were statistically significant (P<0.001). The detection rate of different types of pathogens is highest in winter. Conclusions Children with co-infected pneumonia are mainly aged 0-7 years old. The incidence of pneumonia in children with co-infected is highest in winter. Mycoplasma is the main pathogen in dual infections or co-infections. Co-infections in early childhood are mainly caused by bacterial infections, and the incidence of viral infections increases with age.