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In this work thermopower S, magnetothermopower dS/S, electrical resistivity ro and magnetoresistance dr/r were studied in single-crystals Sm(1- x)SrxMnO3 (x=0.15, 0.2, 0.25, 0.3) and Nd(1-x)SrxMnO3(x=0.15, 0.2,0.3), The study of the magnetic properties of these compounds Showed That they consist of ferromagnetic clusters located in A-type antiferromagnetic matrix. Giant negative magnetoresistance? whish was observed in these compounds, indicates that these clusters belong to ferron type. A sharp increase of S and alue of negative dS/Snear Curie point means that thermopower is caused of ferrons. Therefore thermopower is determined by the doping level and volume of the sample/