Waves are known to be one of the factors to influence the distribution of the seagrass and seaweed beds. The wind environment, which is one of the effective conditional factors of wave formation were investigated over a ten year period (1992-2001) in Hiroshima Bay to clarify the characteristics of the distribution in Hiroshima Bay to clarify the distribution of seagrass and seaweed beds. The index of the wind environment was analyzed based on the frequency of wind direction, velocity of the wind, and force of the wind. In this research, the wind force was estimated by accumulating the value of the third power of the velocity of the wind, and the effect of wind conditions were compared between the northern coasts and the southern ones. The results showed that the wind parameters, frequency of the wind direction, velocity of the wind, and force of the wind were larger in the wind direction of north or north-northeast than other wind directions. Moreover, the force of the northern winds (from NNE to NNAV) was higher by about five times than that of the southern winds (from SSE to SSW). These results suggest that coasts facing the north were more susceptible to force of the wind than coasts facing south.