Objective To compare the value of Real-time three dimensional iRotate imaging、biplane-Simpson’s method and real-time three-dimensional Echocardiography in the assessement of left atrial volume in patients with Paroxysmal atrial Fibrillation.MethodsForty-four(61.0±9.7) patients were studied,Left Atrial phase volumes were measured by real-three dimensional iRotate imaging、biplane-Simpson’s method and Real-time three- dimensional Echocardiography.ResultReal-time three-dimensionaliRotateimaging Echocardiography have a good correlation in measurementing the lfet atrialphase volume in Patients with Paroxysmal Atrial Fibrillation.The difference was nostatistically significant（p＞0.05）.ConclusionReal-time three-dimensional iRotate imaging、biplane-Simpson’s method and Real-time three-dimensional Echocardiography canaccurately measuring left atrial phase volume in Patients withParoxysmal Atrial Fibrillation.It can be used for Clinical.