Based on pot experiment ,Proso yield response to different droughts in five growing periods was analysed,thewater deficits index( ri )and the drop productivity index(Ri)and the preductivity response index(Kyi)were ob-tained. The results show that:grain-filling stage was the most sensitive stage response to drought.When drought oc-cured in the stage,the daily drop product was the highest and the water use efficiency was the lowest. It is also inthis stage that irrigation is the most effective. In shooting and anthesis stage,the reaction between yield and droughtis very little,The evaptranspiration(ET)in tilling stage is the highest,about 28.6%of total ET. The normal evap-transpration in pot experiment was up to 185mm and in droughts was 167mm,and mean WUE was 0.5Kg/mm inthe experiment of drought treatment.ri,Ri,Kyi were used to foretell the proso yield.The estimated result was veryclose to the real yield, also the biomass response to drought was anslysed in the paper.