The surface thermal parameters of Virginia type tobacco leaf were determined by the established measuring method last year. The samples from four typical Hungarian varieties were in climate box, and the thermal effects could be examined by infrared camera. In the laboratory curing box the limit values of tobacco curing were controlled (temperature, relative humidity), so the thermal parameters could be determined in depending on the usual characteristics (water-content of leaf, temperature and humidity of curing air, variety, curing period). The conclusions of results have been the following : the variety and starting moisture-content have a great influence on curing. There is a considerable difference between environmental and surface temperature, due to water evaporation. These effects should be regarded at practical technologies.