The biological yields of different organs and whole plant among different types of maize varieties were compared in the present study, in order to improve the selection efficiency of maize directed cultivation. This study selected 32 representative maize varieties as test materials, according to the maize starch property, grain shape, mature property and application of four kinds of classification methods, respectively, the fresh matter, air-dry matter, dry matter, crude protein and gross energy yields of grain, corncob, bract, leaf, sheath, stem and whole plant for maize in full ripening stage made a comparative study. There were 5 plots per variety and 10 plants were selected in each plot. The results showed that the fresh matter, air-dry matter, dry matter, crude protein and gross energy yields of grain, corncob, bract, leaf, sheath, stem and whole plant had significant differences among different types of maize varieties (P<0.05). According to the classification of starch property, grain shape and mature property, not enough to distinguish the biological yields of different organs and whole plant among different types of maize varieties (P>0.05). According to the classification of application, the significant differences were found in the biological yields of different organs and whole plant (except the air-dry matter, dry matter, crude protein and gross energy yields of corn grain) among different types of maize varieties (P>0.05), which showed forage maize>red grain maize>normal maize>waxy maize. Comparison of normal maize and forage maize, assumed that normal maize to yield 100.0%, the fresh matter yields of grain, corncob, bract, leaf, sheath, stem and whole plant for forage maize were 121.9%, 164.2%, 175.5%, 149.0%, 151.7%, 168.8% and 149.9%, respectively; the dry matter yields of them were 107.9%, 143.7%, 155.1%, 139.4%, 126.1%, 162.0% and 129.1%, respectively; the dry matter yield of them were 107.5%, 143.4%, 155.0%, 139.5%, 125.7%, 162.0% and 129.21%, respectively; the crude protein yields of them were 119.0%, 142.9%, 181.5%, 161.6%, 122.0%, 137.4% and 131.7%, respectively; the gross energy yields of them were 107.7%, 143.8%, 155.0%, 139.4%, 126.1%, 162.0% and 129.1%, respectively. The percentage of dry matter, crude protein and gross energy yields of maize gain in maize whole plant, the normal maize were 47.75%, 57.87% and 48.49%, respectively, while the forage maize were 39.72%, 52.36% and 40.48%, respectively. In conclusion, whole plant feeding of normal maize is the most basic strategy of "grain to feed". The biological yields of gain and whole plant for forage maize are higher than those for normal maize, and forage maize can increase the land use around 30%.