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[Objective] This paper aimed lo reveal the best combination scheme of DMPP, Zn and B in 20-0-20 core masterbalohes, which was suitable for summer corn growth in North China. [Method]20-0-20 core masterbatches adding different addition amount of DMPP, Zn and B was used in this study, and the relationships between different addition amount of DMPP, Zn and B and corn agronomic and yield characters were comprehensively analyzed. [Besull]The agronomic characters of corn showed a trend of increasing frist and then decreasing with the increase of DMPP, Zn and B, and b, c, d core masterbatches had a greater effect on the agronomic characters of corn, plant height, stem diameter, chlorophyll content, which increased 1.12% - 6.74%, 2.76% — 11.11%, 12.28% - 14.65%, respectively, compared with the common 26-10-12BB fertilizer. In the same way, the overall yield characters of corn showed a trend of increasing frist and then decreasing with the increase of DMPP, Zn and B, b core masterbatch had greater effect on yield characters of corn, the corncob length, corncob weight and single biological fresh weight increased, which were 10.66%, 31.66% and 6.32%, respectively, compared with common 26-10-12 BB fertilizer. [Conclusion] In summary, considering the effects and cost control of the core masterbatches, the optimal combination scheme of DMPP, Zn and B in 20-0-20 core masterbatches was DMPP (1.50 kg·t-1) + Zn (30.00 kg·t-1) +B ( 12.50 kg·t-1). [ABSTRACT FROM AUTHOR]