[Abstract] Objective To analyze atrium structure and function in patients with Coronary heart disease or Paroxysmal Atrial Fibrillation,and evaluate value of Echocardiography in the diseases；Methods 30patients with Coronary heart disease（CHD）,30 patients with Paroxysmal Atrial Fibrillation（PAF） and 30 healthy volunteer (nomal control,NC)were enrolled in our hospital from January to December 2014. Cardiography was conducted to obtain left and right Atrial diameter, ejection fraction, straining and straining rate of the three groups. Results Compared with control group,PAF group had reduce ejection fraction straining and straining rate in left and right Atrial;while elevated diameter and volume. CHD group had decrease straining and straining rate,while increased volume in left and right Atrial. Conclusion Both Coronary heart disease and Paroxysmal Atrial Fibrillation cause to accrescent Atrial volume,decrease Atrial function，the destruction caused by Paroxysmal Atrial Fibrillation is more serious. Echocardiography can envaluate the atrial striucture and function with Coronary heart disease or Paroxysmal Atrial Fibrillation, then straining and straining rate imaging base on 2-dimensional speckle tracking technique are more sensitive.