Abstract: The aim of this study was to calculate the drag coefficient (Cd) , surface roughness (Zo) and friction velocity (U*) these characteristics are very imported in (urban planning, pollutants diffusion, Wind Energy (these characteristics are calculated depended on a series of wind tunnel Experiments to different obstacles type, We has used eight type of obstacles Such as Staggered arrays and Regular arrays and with different geometric shapes like a Diamond and cubic. several of empirical equations has been estimated, these equations can be used in urban areas under neutral weather conditions .