With the purpose of evaluating the effects of the slow intermittent drying, on com seed quality, a commercial dryer was used, with different temperatures of the drying air, using seeds of IAPAR 51, cultivar harvested mechanically with 22% moisture content, at Ponta Grossa - PR, in the crop year 96/97. The drying was accomplished in the Processing Seeds Unjt of the Experimental Station of Vila Velha of the Agronomic Institute of Parana (IAPAR). Were used maximum temperatures of 60, 75 and 90°C in the drying air and in the seeds mass: 45, 47 and 55°C, respectively, constituting the treatments. The reduction of the seed moisture content to 13% was monitored through the ?Universal? humidity determinator. The seeds quality were evaluated by physiological quality (germination and vigor: cold test without soil); physical quality (mechanical damages: fast green and purity) and chemical determinations (protein solubility: Kjeldahl and sugars reducers: Fehling). The physical and physiological determinations were accomplished immediately after the drying and repeated after four storage month. The immediate data to the drying were appraised by means of polynomial regression analysis (P≤0,01); soon after, they were compared with the data after the storage through the comparison of averages for the Tukey test to at 5% (Iatent damages). It was concluded that: it is possible to dry corn seeds with 60°C in the drying air and maximum of 45°C in the mass, without affecting the seeds physical and physiological quality; the drying speed for 90°C, in the drying air, although superior to the other experiments, affected the seeds quality; the chemical determinations were insufficient to evaluate the treatments effects in the seeds cellular metabolism, indicating that should be studied other chemical and/or biochemical tests, more specific and sensitive.