We studied the formula screening of multi-functional fertilizer and relationship between soil physical &chemical properties and economic benefits of potato by using the field experiment method in the Hexi Corridor cultivated chestnut soil of Gansu Province .The results showed that :The sequences affected potato yield factors from large to small were compound fertilizer > water retaining agent > polyvinyl alcohol > 5046 inocula > furfural residue .The best combination between factors was :5046 inocula as 101 .25 kg·hm-2 ;compound fertilizer as 1500 kg·hm-2 ;water re-taining agent as 22 .50 k·hm-2 ;polyvinyl alcohol as 67 .5 kg·hm-2 ;furfural residue as 11 .25 kg·hm-2 .There was a positive correlation between the quantity of multi-functional fertilization and soil porosity ,aggregate structure ,water con-tent ,available N ,available P ,available K ,micro organism number ,botanical traits of potato ,economic characters and yield ,and a negative correlation with bulk density and pH value .With the increase of multi-functional fertilizer ,the potato yield and contribution rate of fertilizer were added ,but the marginal output and marginal profit were decreased .On the basis of 1 .40 t·hm-2 quantity of multi-functional fertilizer ,if increasing the fertilizer again ,the marginal profits will be emerged a negative value .According to the regression statistical analysis ,the regression equation between potato yield and quantity of multi-function fertilizer was :y=24 .79+6 .5408 x-0 .9251 x2 .The optimal economical benefit of ap-plication fertilizer was 1 .3999 t·hm-2 ,in this case the theoretical yield of potato was 35 .7602 t·hm-2 .Application the multi-functional fertilizerhe in the cultivated chestnut soil ,it can effectively improve the physical and chemical characters and biological properties of soil .In addition ,the fertilizer profit and potato yield also will be increased .%在甘肃省河西内陆灌区的耕种栗钙土上，采用田间试验方法，研究了多功能专用肥配方筛选及与土壤理化性质和马铃薯经济效益间的关系。结果表明：影响马铃薯产量因素由大到小的顺序依次是：多元复混肥＞保水剂＞聚乙烯醇＞5406菌剂＞糠醛渣；因素间最佳组合是：5406菌剂101．25 kg · hm-2、多元复混肥1500 kg·hm-2、保水剂22．50 kg·hm-2、聚乙烯醇67．50 kg·hm-2、糠醛渣11．25 kg·hm-2。多功能专用肥施肥量与土壤孔隙度、团聚体、蓄水量、碱解氮、速效磷、速效钾、微生物数量、马铃薯植物学性状、经济性状和产量呈正相关关系，与土壤容重、pH呈负相关关系。随着多功能专用肥施肥量的增加，马铃薯产量、肥料贡献率在增加，但边际产量、边际利润在递减，多功能专用肥施肥量在1．40 t·hm-2的基础上，再继续增加施肥量，边际利润出现负值。经回归统计分析，多功能专用肥施肥量与马铃薯产量间的肥料效应回归方程是：y＝24．79＋6．5408 x-0．9251 x2，经济效益最佳施肥量为1．3999 t·hm-2，马铃薯理论产量为35．7602 t·hm-2。在耕种栗钙土上施用多功能专用肥，有效改善了土壤的理化性质和生物学性质，提高了马铃薯的施肥利润和产量。
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