【Objective】Heart Model（HM）is a new method of 3D automatic left ventricular quantitative technique. This experiment is designed to test the feasibility and reproducibility of HM in evaluating left ventricular volume and ejection fraction of patients with pacemaker.【Methods】Echocardiography was performed in 50 patients with pacemaker. All of the two-dimensional and three-dimensional images were collected. Biplane Simpson method，HM method and traditional 3D-manual method were used to measure left ventricular end-diastolic volume（LVEDV），left ventricular end-systolic volume（LVESV）and left ventricular ejection fraction（LVEF），respectively. The measurement results and post-processing time of the three methods were compared. At the same time，the repeatability of HM method within and between groups was evaluated.【Results】The differences among Simpson，HM and 3D- manual in the measures of LVEDV and LVEF were statistically significant（P<0.05）. LVEDV and LVESV measured by HM were larger than those measured by 3D-manual（P<0.05），while LVEF had no statistical significance（P>0.05）. HM and 3D-manual measurements had a very high correlation and consistency. Compared with Simpson and 3D-manual，HM method had the least post-processing time，and the repeatability was good within and between groups.【Conclusion】HM method for automatic evaluation of left ventricular volume and ejection fraction is rapid，feasible and highly reproducible.