In order to determine the appropriate fertilizer formulation for open-field peppers in North China，on the basis of basal application of organic fertilizer，six treatments were set up: no chemical nitrogen(N0)，optimized fertilization(N2)，80%N optimized fertilization(N1)，120%N optimized fertilization(N3)，optimized fertilization with the addition of trace elements(N2+TE)，conventional fertilization(CF).The objective of the study was to investigate the effects of optimized fertilization on yield，quality，nutrient absorption and utilization，and economic efficiency of open field peppers.The results showed that: under the condition of sufficient phosphorus and potassium fertilizer，the optimized fertilization with different nitrogen dosage had the effect of increasing yield，as shown by N2+TE>N2>N1>N3>CF，and the addition of trace elements treatment had the best effect of increasing yield，with 27.52% of yield increase compared with CF treatment.The nitrate content，soluble total sugars，and soluble solids in pepper increased with increasing nitrogen application，while the content of vitamin C decreased.Compared with CF treatment，combined application of organic and inorganic fertilizers reduced nitrate content significantly.Optimized fertilization was able to significantly increase nitrogen，phosphorus and potassium absorption in peppers，but the addition of trace elements was not effective in improving nutrient absorption.The fertilizer use efficiency of nitrogen was 13.24%～24.63%，the agronomic efficiency was 10.78～ 54.31 kg/kg，and the N2+TE treatment was the best.The nutrient absorption of N，P2O5 and K2O for each 1000 kg of fresh pepper was 4.10，1.59 and 6.06 kg，respectively，and the optimum ratio of N∶P2O5∶K2O was 1∶0.39∶1.48.The N2+TE treatment gave the highest net return and output-input ratio of 88 970 yuan/hm² and 15.1，respectively.In summary，on the basis of 7500 kg/hm² of organic fertilizer applied to pepper，the recommended amount of N，P2O5 and K2O are 225，97 and 368 kg/hm²，respectively.Moreover，the appropriate amount of calcium，magnesium，boron and other trace elements could significantly improve the yield，quality，nutrient absorption and utilization and economic benefits.