Atrial fibrillation (AF) is a serious arrhythmia with high morbidity and high disability and mortality rate, which seriously affects the cardiac function of patients. The Department of Cardiovascular Medicine, under the leadership of Prof. Dejia Huang and Prof. Jian Jiang, has been making painstaking efforts on catheter ablation of atrial fibrillation since 2004. A team with solid theoretical knowledge, excellent skills and vigor has been formed, and the number of catheter ablation of atrial fibrillation is more than 300 cases per year, with a rapid growth of 40-50% per year. The indications include not only paroxysmal atrial fibrillation, but also persistent atrial fibrillation, chronic atrial fibrillation, including complex cases of combined valvular disease, cardiomyopathy, congenital heart disease and other underlying diseases. On August 1, 2011, the Electrophysiology Specialty Group of Cardiology ushered in the CARTO 3 system, a brand new calibration system based on the latest technology from Johnson & Johnson. And yesterday, the first case of atrial fibrillation catheter ablation under the guidance of CARTO 3 system in western China was successfully completed. The CARTO 3 system is the world’s leading complex arrhythmia measurement system, which was launched in China in April this year. The two procedures completed in our hospital are the first of its kind in the entire western region. This highlights the academic status of the Department of Cardiovascular Medicine of West China Hospital in western China and even in the country. The CARTO 3 system is the third generation of 3D calibration system developed by Johnson & Johnson based on magnetic field positioning technology. The system adopts the composite technology of magnetic field and electric field, which can find out the location of lesions very accurately, and at the same time, make all the intracardiac catheters can be accurately visualized, and can also accurately distinguish between different electrodes, and even if the electrodes are overlapped or very close to each other, each electrode can still be clearly visible. New technologies, including precise positioning, fast modeling (FAM), multi-lumen mapping, local fine modeling, patient displacement compensation, ECG signal quality, magnetic navigation compatibility, catheter quick connect, software interface using catheter, modeling, ablation, and other clinical languages, not only achieve precise, fast, and synchronized results, but also better anatomical details that can greatly improve the success rate of the procedure and reduce the number of surgical complications. Compared to its predecessor, CARTO 3’s fully process-oriented operation and better development platform enable physicians to master the skills of complex catheter-based radiofrequency ablation faster, shorten the learning curve of the procedure, and improve the efficiency of the procedure. As a result, more physicians will be able to master and utilize catheter radiofrequency ablation, providing more patients with atrial fibrillation with the opportunity to undergo the procedure and helping patients improve their quality of life. With the application of new technology, catheter radiofrequency ablation can be positioned more accurately, the procedure time is faster, and the X-ray exposure is less, which can effectively reduce the radiation exposure of doctors and patients during the procedure and improve the quality and safety of the procedure. It is even possible to perform catheter ablation procedures without X-rays for patients with special requirements such as pregnant women, children and tumor patients. We believe that with the assistance of CARTO 3, the electrophysiology team of West China Department of Cardiology will continue to challenge difficult cases and complete more cases safely and efficiently to relieve the pain of patients with atrial fibrillation.