Abstract：Objective Using the technology of  velocity vector imaging（VVI）to estimate the right ventricular function in patients with pulmonary hypertension（PH）. Methods A total of 60 patients diagnosed with chronic obstructive pulmonary disease（COPD）causing PH in our hospital from January 2017 to December 2018 were selected as the research objects, according to pulmonary artery pressure, who were divided into one group of light and mediate PH（group A）and the other group of serious PH（group B）, thirty patients in each group. Meanwhile, 30 healthy adults were collected as the control group. The right ventricular motion maps of three cardiac-cycles were collected from the standard and clear apical four-chamber section of the heart. Afterwards, with the pattern of VVI, the velocity and strain rate curves were used to measure the systolic, early diastolic, late diastolic peak velocity（V）and peak strain rate（SR）of the myocardium of each segment of the right ventricle, and the comparison and analysis were made at the same time among these groups. Results With the increase of pulmonary artery pressure, the right free ventricular wall, V and SR on the right ventricular surface of the interventricular septum gradually decreased, especially the decrease of SR was more obvious. Therefore, SR may be more meaningful in the early evaluation of the right ventricular function in patients with PH. Conclusion VVI technology can not only accurately measure the changes of V and SR in the myocardium of the right ventricle of patients with PH, but also analyze the changes of right ventricular myocardial function of patients with PH earlier, more accurately and more detailed than the ordinary cardiac ultrasound.