Objective To study the effect of echocardiography on cardiac resynchronization therapy（CRT） in patients with heart failure. Methods From January 2018 to January 2020

18 patients with heart failure who received CRT treatment in our hospital were selected. All patients underwent AV and VV interval optimization after surgery

and summarized the heart failure changes in functional indicators and cardiac synchronization indicators before and after surgery. Results One week after operation

there was no significant difference between the patient’s cardiac function and cardiac synchronization indicators compared with the preoperative index（p<0.05）

but the patients’ LVDD

LVDS

LVEDV and LVESV were compared with those at 3 and 6 months after operation. The preoperative comparison was significantly lower

while the 6 MHW and LVEF were significantly higher than preoperative（p<0.05）

and the postoperative cardiac synchronization indexes were significantly better than preoperative（p<0.05）.Conclusions The use of echocardiography to optimize the AV and VV intervals of patients with heart failure after surgery can improve the effect of cardiac resynchronization therapy

and effectively improve the patients’ biventricular synchronization and cardiac function. It is worthy of promotion.