The Seebeck effect of thermoelectric mortar made by calcined magnetically separated fly ash aggregate and the enhanced Seebeck effect of the thermoelectric mortar adding metallic oxide powders were investigated. The results show that the Seebeck coefficient and the electrical conductivity of thermoelectric mortar is quite high. A new carrier is provided and its effective mass increase by doping with metal oxide powders, also the Seebeck coefficient of thermoelectric mortar