In the heavy snowy and cold cities, huge energy and cost have been spent for cleaning snow in urban area, especially in public area roads and pedestrian ways. It causes to the global warming, therefore cutting back on the emission of gases is required to the urban design in the snowy cities. Authors developed the block designs that reduce the snow accumulation on the public roads and pedestrian ways in downtown area Sapporo City, Hokkaido Japan. Four types of the block designs, individual developing type, unified height type, mountain shape type and close rounding type were compared how much accumulate snow in the public area with snow simulations using the wind tunnel. At the result, the block design with close rounding type should be most desirable design for reducing snow cleaning energy and emission CO2 gases in downtown area.