Abstract: Objective:To summarize the echocardiographic features and clinical treatment experience of cardiac tumors in children and adolescents. Methods:The hospitalized cases of cardiac tumors between January 2013 and January 2020 were selected from Pediatric Cardiovascular Center of Beijing Anzhen Hospital Affiliated to Capital Medical University. The echocardiographic features and clinical data were retrospectively analyzed and summarized. Results:A total of 24 patients were included into the analysis. Complete tumor resection was performed in 20 patients and partial resection was performed in 4 patients. Postoperative pathology showed benign lesions accounted for 79.2% (19/24), malignant lesions for 4.2% (1/24) and tumors of uncertain biological behavior for 16.7% (4/24). Among them, there were 7 cases of myxoma, 6 cases of rhabdomyomas, 4 cases of inflammatory myofibroblastoma, 3 cases of fibroma, 1 case of fibrosarcoma，teratoma，hemangioma and thrombus for each. The right ventricle and left atrium were main sites of cardiac tumors. Diagnosis accuracy of echocardiography for cardiac tumors was 29.2% (7/24), and it was 85.7% (6/7) for myxoma due to the high specificity of echocardiography. The echocardiographic features of myxoma included low to moderate echoes, lobulation, irregular shapes, loose structures, high mobility, and attached pedicles.Shapes of myxoma changed with the contraction and relaxation of the heart, and the tumor was embedded in the atrioventricular valve opening to different degrees during diastole, causing secondary stenosis of the atrioventricular valve. Conclusion:Benign tumors are more common in children and adolescents. The common cardiac tumors are rhabdomyomas and myxoma. Diagnosis accuracy of echocardiography is high for myxoma.