[Objective] In order to provide scientific references for mitigating urban thermal effect and optimizing organic mulch materials, effects of three kinds of land surfaces (bare sandy loam, red mulch, and yellow mulch) on local temperature during summer (June to August) were analyzed. [Methods] Using the surface meteorological data observation method, land surface temperature of the three underlying surfaces was measured with a handheld thermal imagine camera, and air temperature was recorded by a real-time thermohy grometer. The influence and variation characteristics of their contribution to local environmental thermal effect were analyzed. [Results] ① Temperature dynamics of local air and the three land surfaces were synchronized. Thermal effect on local environment was ranked in the following order: bare sandy loam > red mulch > yellow mulch. ② During July, the mulch moderated the thermal effect to some extent but not significantly. While both yellow mulch and red mulch could reduce heat, significant differences (p<0.01) was only found with yellow mulch for the months of June and August, when compared to bare sandy loam. ③ Regression analysis to the surface temperature and air temperature of the three underlying surfaces indicated a linear relationship between land surface and air temperature (R² > 0.95), and land surface temperature of the three materials could be predicted by model testing. [Conclusion] For urban areas where soil quality is poor and vegetation is difficult to establish, such as places with bare sandy loams, organic mulch can mitigate the thermal effect of the local environment in summer. It is suggested to choose yellow and other light color mulch materials.