Abstract: The effects of seasons on the quality and nutritional values of whole-plant corn silage in silos were evaluated in this study. The silage were sampled 5, 10, 20 or 40 cm behind the removal surface of whole-plant corn silage in aboveground silos in winter, spring and summer, and analysed for the quality, chemical components and in vitro DM digestibility. The results showed that the population of microorganisms in the silage was not affected significantly in winter and spring (P>0.05), but the fungal population in the silage taken 5 or 10 cm behind the removal surface was higher in summer than that in spring or winter (P<0.01). After decreasing to 3.76, the pH value of the whole-plant corn silage continued to drop for a long time from the winter to next spring and summer during which the nutrients unavailable to microorganisms such as NDF and ADF, increased gradually and those available nutrients such as total sugars, decreased proportionally, and in vitro DM digestibility decreased gradually, too. Therefore, nutritional values of whole-plant corn silage decreased gradually during storage in silos, and the daily removal rate of the silage should be over 10 cm in summer.