This article summarizes proposals of different international guidelines,clinical cases in clinical institutions at home and abroad and the latest research progress of tumor patients with implanted cardiac pacemaker.In addition,the various factors during the implementation of radiotherapy were analyzed.It is possible that reducing the risk grade and minimizing the unfavorable factors for pacemaker could be achieved by designing the scientific treatment plan and setting the reasonable radiotherapy plan.The radiotherapy plan can be established safely and effectively in malignant tumor patients with implanted pacemaker.