Abstract: Using a split-plot design, five maize hybrids were studied on the traits as kernel moisture and grain drying rate, etc. The resluts showed that there was significant difference among tested varieties’ kernel moisture at physiological ripening from 35.61% to 42.17%. The extremely significant difference existed among tested varieties’ kernel moisture at harvesting from 15.49% to 28.50%. The significant difference appeared among tested varieties’ average kernel dry-down rate varied from 0.5296%/d to 0.9007%/d from the 35th day after silking to physiological ripening. There was significant difference among tested varieties’ average kernel drying rate from 0.4246%/d to 0.5935%/d from physiological ripening to harvesting. For the tested hybrids, it has significant correlation between kernel moisture and some plant traits as days from plant emergence to silking, plant height, green leaves at milking stage and kernels weight per ear, etc. Tested hybrids’ kernel dry-down rate was significantly influenced by ear length and ear diameter. For particular tested hybrid, kernel drying rate after physiological ripening was significantly affected by humidity in field.