Several grid generation technologies are compared based on computational wind engineering. The advantages and disadvantages of structured grids and unstructured grids are opposite and mutually complementary, so mixed grids represent the current and future major development trend of grid generation. Adaptive Cartesian grids can be generated automatically, and show a great advantage for isotropic flow simulation. Adaptive Cartesian grids are particularly suitable for low speed complex turbulence flow simulation on wind engineering, for most professionals currently have a poor capacity for grid generation.