Chlamydia pneumoniae (Cpn) is a pathogenic microorganism transmitted through the respiratory tract, which is a specialized intracellular parasitic prokaryotype organism with a unique development cycle. Chlamydia pneumoniae infection is an infectious disease caused by Chlamydida pneumoniae that can cause acute respiratory infections in children. It is also associated with many non-respiratory diseases such as hepatitis, encephalitis, arthritis, Guillainbar syndrome, cardiovascular disease, etc. Therefore, the detection of Chlamydial pneumoniae is important for confirming the diagnosis.