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The pseudorapidity dependence of charged-particles ratios in three transverse momentum regions, obtained by hadron production models, in proton–proton collisions at 7 TeV are compared with the measurements of LHCb detector. Compared to the experimental data, the ratios are independent of and and are very well predicted by all models (DPMJETIII, EPOS1.99, EPOS-LHC, HIJING1.383, QGSJETII-04 and Sibyll2.3c). All models predict the ratio at low for , but underestimate afterward while reproducing the experimental data at medium and high very well. The ratio is described by the models very well at high in the low and medium region. At high , models predict the experimental data well, except Sibyll2.3c that slightly overestimates. The ratio is predicted by EPOS1.99, HIJING and Sibyll at low and EPOS-LHC, EPOS1.99 and Sibyll predicted at high for low . For medium , EPOS1.99 and …