Abstract: The impact of stalk mulching on the microclimate of intercropping ecosystems in upland red soil was studied through field experiments. Stalk mulching can increase the flow caloric flux, decrease the soil caloric flux and laent caloric flux in upland red soil. As a result, air temperature near the ground and soil humidity are enchanced, soil temperature and humidity near the ground are declined. Stalk mulching has the effects of keeping the soil moisture and lowering the ground temperature.