Patients with tumor combined with heart failure are treated similarly to other heart diseases that cause heart failure. If the heart failure is caused by antineoplastic drugs, it is necessary to stop the antineoplastic drugs or reduce the dosage, or change to other regimens. After the patient’s heart function, i.e. heart failure, has stabilized, and the patient has been assessed to be able to tolerate the next chemotherapy, further antineoplastic therapy can be taken. In the meantime, patients who have already developed heart failure can be treated with pharmacological interventions to treat the patient’s cardiac insufficiency. If the patient has acute heart failure, diuretic drugs, vasodilator and cardiotonic drugs can be used to improve the state of the heart. In the case of chronic cardiac insufficiency, oral medications can be chosen for the benefit of improving the patient’s cardiac insufficiency, reducing the occurrence of heart failure in the patient’s later life, and reducing death due to heart failure.