Abstract: Abstract：The effect of ecological planning on local climate in Guangyang Island of Chongqing City is investigated by numerical simulation of urban micro-scale model. The results show that Guangyang Island is dominated by northerlies in January, and the wind speed in west part of the island is relatively bigger. However, the island is prevailed by easterlies in July. The temperature field of the island shows a east-west contrast pattern, i.e., the east (west) part is high (low), in both January and July. The comfort analysis shows that the island is quite comfortable in January, but is not so comfortable in July because of high temperatures. The numerical simulation of ecological planning shows that the most notable effect of the planning on local climate is temperature field. The ecological planning could significantly reduce the temperature, which improves the human comfort in July.