Objective For decreasing the mistreatment and the excess treatment of Chlamydia trachomatis pneumonia,this article analyze Chlamydia trachomatis pneumonia clinic features in the infant.Methods Making review analysis to the clinic data of 64 infant age of 0 to 3 months old suffering from Chlamydia trachomatis pneumonia.Results The infection history of these babies is not identify in their perinatal period.The average age when they were ill is 32.77?19.03d;It happened more frequently in spring and winter.The patient's condition is gently with cough as their feature,following fever,gasping,fine crackles,or none of those.It does not prolong the course of disease by following the air tube virtue infection.The increase of the Blood white cell is 43.8% and that of the neutrophile is less than 20%.The level of Few CRP increase.The abnormal of the baenosome X-ray is on both sides.It can relieve symptom and physical sign,and shorten the time in hospital for using the macrolide medicine,and it surpass the cephalosporin.Conclusions The Chlamydia trachomatis infection does not result in the damage of the organ,even if jeopardizing the life.It is helpful to recognize the clinical course correctly for the analysis of the complicated clinical condition exactly.