The effect of different concentrations of Paclobutrazol on growth and yield of barley( Paul barley No. 8) was conducted. The results showed that barley plant height,lodging percentages,and thousand grain weight reduced under 15% Paclobutrazolwettable powder spraying,while the productive panicle and yield increased. One thousand times of Paclobutrazol decreased the height of barley significantly( P < 0. 05),and five hundred times of which reduced barley lodging percentage and while increased the yield signif...