Abstract: It is necessary to quantitatively analyze key climatic parameters affecting the microclimate and appropriate landscape elements improving the microclimate according to the environmental factors in the microclimate design of landscape. Taking Baihuatan Park of Chengdu City as an example, this research selects seven observation points to measure the microclimate parameters, including temperature, wind speed, relative humidity and solar irradiance, and objectively evaluates the thermal comfort of the observation points with the measured data. It further quantitatively analyzes the correlations between microclimate parameters and thermal comfort, and the correlations among microclimate parameters. The results show that in humid and hot areas, the key microclimate parameters affecting garden microclimate comfort are wind speed and solar irradiance; and water and plants are relatively more suitable landscape elements for improving high temperature and high humidity climate, and the microclimate effect of water is better than that of plants. The research contents and results provide new research ideas and technical methods for optimizing garden climate in hot and humid climate areas, and promote the construction of healthy climate in gardens.