Xianyu 335’was used as material in the experiment,the effect of different potash application methods on growth and development,nutrition absorption and yields of spring maize was studied in high yield demonstration zone of YuShu City.The results showed that the yield of the sixth treatment of potash fertilizer 90 kg/hm²,1/2 base fertilizer,1/2 elongation stage topdressing（1:1） was the highest.Applied potash fertilizer later could significantly improve the maize yield.Potash fertilizer agronomic efficiency,potash fertilizer use efficiency and potash fertilizer partial productivity declined with the increasing of potash ap plication rate.At the same amount of potash fertilizer,potash fertilizer use efficiency,potash fertilizer agro nomic efficiency and potash fertilizer partial productivity were improved by applied several times compared with one time.The sixth treatment of this experiment（basic fertilizer: elongation fertilizer of 1:1） was the best potash application method to balance production and environment.