Introduction: Asthenic, hoarse voice and dyspnea are occasionally shown in a variety of cardiac problems. The greatly dilated pulmonary artery or aortic arch results in compression of the left recurrent laryngeal nerve and produces a cardiovocal (Ortner’s) syndrome. Also, pulmonary function (forced vital capacity, FVC and forced expiratory volume in one second, FEV1) relating phonation in patients with congestive heart failure is diminished. The purpose of this study was to examine the change of deviant voice physiology after operation in the ventricular septal defect(VSD), patent ductus arteriosus( PDA) , and atrial septal defect(ASD). Patients and Methods: Fifty six children with congenital heart disease (31 females, 25 males; mean age 17 mo, SD 11mo) were investigated at the Chonbuk National University Hospital. Their cries were analyzed before operation, 1 week after operation and 1 month after operation. Acoustic parameters(fundamental frequency, duration, NHR, jitter¸ and shimmer) were extracted with Multi - dimensional Voice Program using the Computerized Speech Lab hardware system. Results: In the VSD, the fundamental frequency(Fo), duration and NHR values showed no significant changes. The values for jitter(preop: 3.6±3.1, postop: 1.1±1.0) and shimmer(preop: 0.8±0.5, postop: 0.5±0.3) decreased after the operation (p0.05). The Fo, duration values in the PDA decreased within statistically negligible range. Jitter(preop: 3.3±3.0, postop: 1.5±2.3), shimmer(preop: 0.8±0.5, postop:0.5±0.5) and NHR(preop: 0.3±0.2, postop: 0.2±0.2) decreased (p0.05). The values of Fo, duration and NHR in the ASD did not show any significant changes. The jitter (preop: 2.4±1.4, postop: 1.0±0.4) and shimmer (preop: 0.6±0.3, postop: 0.3±0.1) decreased after the operation (p0.05). Conclusions: With the operation for the congenital heart diseases, some significant acoustic effects were observed. These data suggest that the operation for congenital heart diseases with left to right shunt is able to enhance acoustic and pulmonary function.