Based on the common forms of window opening in board hotels, PHOENICS software and CFD technology were used to simulate a variety of indoor wind environment. The open area, height of window sill, window form, position and shape of the window were varied for the simulation. The freshness of the air, relative to the appropriate wind speed, and the number of ventilation in the bathroom were adopted to evaluate the strategy analysis of the ventilation from different forms of windows. Suggestion strategy was given according to different needs for specific window.