Abstract: The parameter of the curve fitting process was analyzed on grain filling process with different rowed barley in the field. The experimental results indicated that barley grain filling process showed S-curve of “slow-fast-slow”, and the Logistic equation was at significant level (R2＞0.9906). During the grain filling period, the duration of slow increasing stage was the longest, the duration of rapid increasing stage was followed, and the duration of gradual increasing stage was the shortest, in which the average filling rate of rapid increasing stage was the highest, and the final dry matter accumulation was significantly higher than the other two stages. The average rate of grain filling (except for V1 of Zhu 3 barley variety) and the final dry matter accumulation for two-rowed barley were higher than those for six-rowed barley. The actual 1 000-grain weight of different rowed barley was lower than the theoretical 1 000-grain weight. To achieve super high yield, the two-rowed barley should have high grain number per spike and the six-rowed barley should have high 1 000-grain weight．

Key words: barley, grain filling, yield