Abstract：Field spreading of either TPK( potassium hydrogen 1-triacontyl phosphate, with the concentration of 0. 01 mg/L) or TA( triacontanol, with the concentration of 0. 5mg/L)could obviously improve the yield traitsin autotetraploid barley, and their degrees of improvement were almost the same. In result, the length of spike neck w as exserted from 2. 4cm to 3. 7cm, and the incidence of spike w rapping w as reduced.At the same time, the spike weight from 1. 145g to 1. 338g, the seed setting percentage from 75. 0% to 79. 5%, and 1000-grain weight from 43. 638g to 50. 031g were increased respectively.