This work was carried out during two consecutive years (1987 and 1988) at Sete Lagoas state of Minas Gerais, Brazil to evaluate the effect of mechanical harvest using a combine upon sorghum seed quality. Twelve treatments, resulted from a combination of one cultivar BR 007-B as a maintaning line, with three seed moisture content levels (22% to 25%, 18% to 22% and 16% to 18%), three cylinder speed rotation (470rpm, 680rpm and 980rpm) and a hand harvest (control) were studied. The seed quality were evaluated by germination test field emergence and vigor test (cold test and speed germination index). The results indicated that in the year that occured good conditions after seed maturity, the quality was higher independently of the seed moisture levels. In general, in the lower moisture leveIs there were no significant differences among hand harvest and mechanical harvest. On the other hand, when the adverse conditions occured, there were a field seed deterioration and the best quality seeds was achieved early with seed moisture content levels of 22% to 25% with the lowers cylinder speed rotation (470rpm and 68rpm).