Wam model is used with resolution 0.25^O to simulate wind and swell wave's behavior that is generated with constant wind speeds (0.1 m/sec to 20 m/sec). The area of study is over the Pacific Ocean (24°S - 3°N and135°W - 109°W).
 It is found that the model results show for near calm wind case (0.1 m/sec), no significant impact up to 72 hours on wave height, swell and total wave height. It is also shown in the later case that the wave height is mainly swell wave. In this work a threshold wind speed value (about 7 m/sec) is detected. It is found that swell wave height decays (develops) with time as wind speed is below (above) the threshold value.