Abstract: With the stable long-acting nitrogen fertilizer as the material of the experiment, the effect on the yield and efficiency of spring maize was studied in Yuci, Shanxi Province to explore the role of the long-acting ammonium chloride in prolonging fertilizer efficiency, improving crop yields and reducing the topdressing times. The results showed that, when the farmers’ conventional amount of fertilizer was applied the long-acting ammonium chloride significantly increased maize yield of 1132 kg/hm2 by improving yield components, increased economic benefit of 2804 yuan/hm2, and total nitrogen uptake, nitrogen use efficiency and agronomic efficiency respectively enhanced by 80.44 kg/hm2, 33.52% and 4.72 kg/kg compared with the treatment of ordinary ammonium chloride of conventional amount. The maize yield of the treatment that 90% of the amount of long-acting ammonium chloride fertilizer was applied had no significant difference with the yield of ammonium chloride of conventional fertilization, and could increase economic benefit of 308 yuan/hm2, and total nitrogen uptake, nitrogen use efficiency and agronomic efficiency were also improved while the maize yield of the treatment that 85% of the amount of long-acting ammonium chloride fertilizer was applied made the yield significantly reduced. Taking economic and ecological benefits into account, 90% of the amount of long-acting nitrogen fertilizer could be served as the recommended amount of fertilizer in spring maize of the local.