Objective To investigate the detection of atrial fibrillation in patients with routine electrocardiogram（ECG） examination

analyze the incidence rate of atrial fibrillation in different ages and the characteristics of ECG.Methods A retrospective analysis of 126276 patients who underwent routine electrocardiogram examination in electrocardiogram room from 2017 to December 2020

was divided into 7 groups by age

and the detection rate of atrial fibrillation in all age groups was analyzed. Results The detection rate was 3.46% in male and 3.45% in female

and the detection rate was the highest in group over 80 years old

With the increase of age

the detection rate increased

and the difference was statistically significant（p<0.05）. Among them

the most common ECG phenomenon was st or（and） T wave abnormality

followed by fast ventricular rate type

incomplete right bundle branch block and ventricular premature beat. Conclusions Routine ECG is a simple and convenient detection technology for atrial fibrillation and other abnormal ECG phenomena

with significant clinical application value.