Abstract: Evaluation of the benefits of agricultural meteorological services is a crucial basis for improving the agricultural-meteorological service methods and enhancing service capabilities and effectiveness.In this study,six experimental sites were established in Jinzhou and Tieling cities,Liaoning Province,where a one year-long comparative experiment on spring maize planting meteorological services was conducted in 2023.By observing meteorological elements,such as maize growth stages,emergence rate,net photosynthetic rate,water and fertilizer management,crop model simulations and field surveys,the benefits of spring maize planting meteorological services were quantitatively evaluated from four aspects: timing,management,yield,and economics benefit.The results indicate that in 2023,compared with farmer-managed experimental maize production plots (farmer-managed control plots),the experimental plots in fine-tuned spring maize planting meteorological services (meteorological service plots) showed an average advancement of maize planting dates by 13 days,an extension of the entire growth period by 10 days,utilization of accumulated growing degree days increase by 86.0 ℃.The average emergence rate increased by 4.7%.The drought resistance of maize during summer was enhanced,with an increase of 16 μmol CO₂ m^-2·s^-1 in leaf net photosynthetic rate in responsive plots and a noticeable delay in leaf wilting exceeding more than 2 hours.Validation of the crop model showed that the normalized root mean square error (NRMSE) and the concordance index between the observed and simulated maize growth stages ranged from 1.55% to 1.78% and from 0.77 to 0.90,respectively.For maize yield,the NRMSE was 7.10%,with a concordance index of 0.83,indicating a good consistency between observed and simulated values,and confirming the reliability of the experimental results.The contributions of spring maize planting meteorological services to yield increase and net income is 9.2% and 12.6%,respectively.