Objective To investigate the correlation between vitamin E and community acquired pneumonia (CAP) .Methods A total of 128 cases of CAP(CAP group) and 135 people undergoing the healthy physical examination (excluding CAP ,control group) in our hospital from Jan .2016 to Dec .2016 were chosen .Each group was divided into the age subgroups of 0-17 years old ,18-40 years old and 41-65 years old .Vitamin E ,Chlamydia pneumoniae(CPn) and mycoplasma pneumoniae(MP) were detected in all the subjects .Then the obtained data were statistically analyzed .Results The average vitamin E was (15 .43 ± 4 .37)mg/L in the control group and (6 .37 ± 3 .24)mg/L in the CAP group ,the difference between the two group was statistically significant(P<0 .05) .In the control group ,there were 7 cases of MP positive and 6 cases of CPn positive .In the CAP group ,there were 32 cases of MP posi‐tive and 25 cases of CPn positive .The differences of MA and CPn positive between the two groups were statistically significant(P<0 .05) .The vitamin E levels in the 0 -17 years old ,18 -40 years old and 41 -65 years old subgroups of the control group were (14 .75 ± 4 .12) ,(16 .42 ± 4 .35) ,(16 .42 ± 4 .35)mg/L respectively ,while which in the various subgroups of the CAP group were (5 .43 ± 3 .18) ,(7 .74 ± 3 .65) ,(7 .74 ± 3 .65)mg/L respectively ,the difference in different age groups between the two groups was statistically significant(P<0 .05) .Conclusion Maintaining a high level of serum vitamin E level could effectively prevent CAP .