Abstract: In order to screen for a convenient, cost-effective, and environmentally friendly method to enhance the prevention and control of common bacterial blight in common beans, and to improve seed yield and quality, the present study utilized the common bean variety Kenyun 15 as the experimental material. Employing a split-plot experimental design, with planting density（M） as the main factor and control frequency（T） as the secondary factor, a mixture of fungicides(35% quinocetone-copper, tetracycline suspension concentrate 40 g·L^-1, 30% pyrazoxystrobin suspension concentrate 30 g·L^-1, and 30% tebuconazole emulsion 20 g·L^-1) were sprayed during the flowering period. Through the investigation of disease indices, control efficacy, yield, plant height, and other indicators, the study aimed to elucidate the preventive and control effects of green measures against common bacterial blight in common beans under different planting densities.The results indicated that, without control measures, the incidence index of common bacterial blight increased with the rise in planting density. Under various planting densities, the incidence rate of common bacterial blight significantly decreased with an increase in the frequency of control. Among different planting densities, the control efficacy was highest under the T3 treatment, with M1T3, M2T3, and M3T3 achieving control efficacies of 75.05%, 73.97%, and 84.11%, respectively. Meanwhile, compared to the untreated control, the application of T3 treatment resulted in yield increases of 11.52%, 9.03%, and 8.68% under various planting densities. Through a comparative benefit analysis, it is recommended to conduct two control measures at low planting density and three control measures at medium and high planting densities for effective management.