Low-carbon society is being implemented by concrete action nowadays. In Japan Otsu, Shiga Prefecture, how to plant street trees (Roadside trees) that came out of new ideas, may reduce the heat island phenomenon. In this study, we found the method how to suppress the temperature of ground surfaces by using of fluid dyna-mation simulation. And then, the result of this shows the optimal solution to plant beautiful roadside greens in the sophisticated city.
