Based on the hot and humid climate and the underlying surface of Guangzhou

taking a typical community in Guangzhou Higher Education Mega Center as the test site

we analyze the microclimate characteristics over this area by meteorological observational data and a numerical model ENVI-met under typical sunny weather condition. The results indicate that the ENVI-met model can successfully simulate the special distribution and temporal evolution of temperature

humidity and flow field. ①  There exist high temperature and low humidity

low temperature and high humidity over the different surfaces. ② Channeling effect can be found between the Adjoining Buildings

and the wind speed will become 1.4 to 1.7 times of the upper stream. ③ The corner flow can take place on two sides of the Single Building

and wind gust may be two to three times of the average wind speed. ④ There exists vortex between the Street Canyon Buildings. This effect is connected with the aspect ratio and the approach flow. This study helps us better understand some microclimate phenomenon in the area under sunny weather condition

which may play an important role in pedestrian comfort and diffusion of air pollutants

and can represent the features of hot and humid area. The research has practical significance for the city planning in the region with similar microclimate characteristics.