Abstract： Objective To analyze the distribution characteristics of the posterior/anterior corneal curvature radii ratio(B/F ratio)in cataract patients and their correlation with intraocular biological parameters.To provide useful information for optimizing IOL calculation formula of routine cataract and with previous corneal refractive surgery.Methods One hundred and eighty-two eyes of 169 cataract patients were enrolled in the study.The preoperative results of Pentacam and IOL Master were statistically analyzed,and the corrected corneal refraction index of each eye was calculated.Results The average B/F ratio of the population in this study was(82.04+1.68)％,which was positively correlated with age(r p=0.313,P＜0.001),Kp(rp=0.567,P＜0.001)and posterior corneal curvature radius R2(r p=0.566,P＜0.001).Corrected corneal refractive index N was 1.322 9～1.330 6(1.328 2±0.001 0).Conclusion The B/F ratio of the population in this study and the corrected corneal refractive index N are similar to the results of related studies at home and abroad,and smaller than those of Gullstrand model eye.When the B/F ratio is low in cataract eyes,a special IOL refractive power calculation formula should be considered.