Campus is the main place for the activities of teachers and students． In order to study the influence of different underlying surfaces on human comfort，three types of underlying surfaces with different properties are selected in Huguang campus of Guangdong Ocean University to carry out the observation and numerical simulation of microclimate in summer． Origin，SPSS，and ENVImet softwares are used for data processing． The results are shown as follows． (1)Under the existing greening and building layout of the campus，wind has a great impact on the microclimate． When there is no precipitation in summer，the less shaded grassland with poor ventilation condition has higher temperature， lower humidity，and less comfort． (2)Reasonable dense planting of tall green forest can effectively reduce the ground temperature in summer． (3)ENVImet model has a good simulation effect under stable tropical weather conditions，which can reflect the regional microclimate characteristics of the campus to a certain extent． The simulation results can provide scientific basis for the optimization of campus infrastructure construction and the travels of teachers and students．