Objective To investigate the monitoring effect of 3D transesophageal echocardiography in transapical transcatheter aortic valve replacement（TA-TAVR）.Methods Forty-four consecutive patients with?aortic stenosis underwent J-Valve valves replacement via the transapical route at Xijing Hospital were selected.All patients underwent 3D-TEE examination to evaluation of aortic root structure，valve lesions under 2 Preoperative TEE was applied，Guide the J-Valve delivery system into the left ventricle and release the prosthetic valve during the operation，and evaluate the effect and postoperative complications immediately after procedure.Results Under the guidance of 3D-TEE real-time monitoring，42 of 44 patients successfully implanted J-Valve，with a success rate of 95.45%.The coincidence rate between the valve model predicted by 3D-TEE and the final implanted valve model was 76.19%.The incidence of immediate postoperative perivalvular leakage was 33.33%.Compared with preoperative，there was no significant change in left ventricular ejection fraction postoperative.Conclusion Three-dimensional-TEE plays an important role in guiding TA-TAVR，and can evaluate the effect and complications immediately.It is an indispensable auxiliary means for success of TA-TAVR.