According to 26 varieties studied.The grain yield and economic coefficient of new varieties were higher than those old varieties.The biomass of both kinds of varieties was smiller.The dry matter of leaves exported most to the grain.The leaves of varieties with high stem and curved panicle contributed more than those of varieties with short stem and erect panicle.Leaf sheath exported dry matter, while stem needed to take dry matter for growth.Dry matter in grains of varieties with high stem and curve panicle were all produced after heading.The varieties with short stem and erect panicle had partial dry matter in grain exported from shored matter before heading.The tendency was unanimous in dry matter accumulation between the varieties of different types.