Objective      To evaluate the clinical value of speckle tracking imaging（STI） by quantitatively analyzing longitudinal strain and left ventricular torsion in patient with coronary heart disease （CHD）.       Methods      Thirty patients who had at least one branch of coronary arteries with stenosis over 75% identified with angiography and admitted in Department of Cardiology of our hospital during February to April 2011 were enrolled in this study. Another 25 sex- and age-matched healthy volunteers served as normal control. They all underwent STI examination. Two-dimensional images of the apical long-axis view

four-chamber view

two-chamber view and left ventricular short-axis view at the levels of mitral annulus and apex were recorded. Longitudinal strain

average total strain

left ventricular torsion

torsion rate and time to peak were measured.       Results      In control group

the longitudinal strain was increased along with the distance from the base (P0.05). While

CHD patients showed significant reduction in the longitudinal strain

with the longitudinal strain of different sections and the average total strain significantly lower than those in the normal control （P0.05）. The average total strain value of  -19% had a sensitivity of 86.4% and a specificity of 83.3% when it was used to identify ≥75% coronary lesion. CHD patients showed significant reduction in the torsion

torsion rate

and significantly delayed time to peak（P0.05）.       Conclusion      STI is a simple and reliable new method for clinical evaluation of LV regional and global systolic function in patient with CHD.