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The effect of buildings on flow in urban canopy is one of the most important problems inlocal/micro-scale meteorology. A large eddy simulation model is used to simulate the flow structure in andemonstrate that: (a) The inflow conditions affect the detailed flow characteristics much in the buildinggroup, including: the distortion or disappearance of the wake vortexes, the change of funneling effect areaand the change of location, size of the static-wind area. (b) The bulk effect of the buildings leads to a losslos effect changes little when the inflow direction changes. (c) In the bulk effect to environmental fields,the change of inflow direction affects the vertical distribution of turbulence greatly. The peak value of theturbulence energy appears at the height of the average building height. The attribution of fluctuations ofhorizontal speed fluctuation attribute mostly, while the vertical speed fluctuation does in high levels.