Echocardiographic strain and strain rate imaging is a new technique that is more reliable and easier to understand for evaluating cardiac function. Because it can identify active and passive myocardial segmental motion and quantify ventricular synchronization to evaluate cardiac function, it is more clinically applicable. For example, longitudinal myocardial shortening, which cannot be evaluated visually, can be detected early by highly sensitive tissue Doppler and two-dimensional speckle-tracking-derived strain and strain rate, which can be applied to the clinic as a new noninvasive test method. Moreover, it can also be used for early detection of myocardial function abnormalities caused by different etiologies, evaluation of myocardial activity, detection of allograft rejection after cardiac transplantation, early detection of patients with coronary artery transplantation, and patients after medical or surgical treatments. The strain and strain rate method is of great significance for the selection of different therapeutic regimens and the follow-up evaluation of cardiac function, and the strain and strain rate can provide very important prognostic information. Zhang Xiaosuan, Department of Diagnostic Ultrasound, Affiliated Hospital of Inner Mongolia Medical University, Echocardiography is the primary function of echocardiography to analyze and evaluate the local myocardial function by obtaining information from the ventricular wall motion, however, the visual assessment of the ventricular wall motion is more subjective and influenced by the operator. It has a high degree of variability, and it can only evaluate radial displacement and deformation of the myocardium, not shortening and torsion of the myocardium. In recent years, velocity imaging, displacement imaging, and deformation imaging (strain and strain rate) are newer techniques in echocardiography that allow for a broader and more reliable evaluation of cardiac function.