Piglets communicate with their sow by using special sounds and synchronize their suckling behavior with their mother＇s grunting. This study sought to find an effective sound for controlling the nursing／suckling behavior of pigs. Eighteen crossbred Landrace×Yorkshire sows and their piglets size studied on days 1, 7, and 14 post-partum. The parity of the sows was three or four. The litter size ranged from 9 to 11, with a mean fo 10.4 piglets. Thirty minutes after the end of the last suckling, either the nursing-suckling sound (NSS) or the nursing-suckling sound ＋ click sound (NSSCS) was played for 90s randomly, and this experiment was repeated three times. The behavior of the sows and their piglets was reecorded using camcorders and observed each second. When comparing NSS and NSSCS, there was less lying and sleeping and more sitting, standing, walking, and massaging when NSSCS was played than when NSS was played. These results suggest that NSSCS may iduce more nursing suckling in pigs than NSS.