The inconsistency of hydrological sequence was destroyed by climate change and human activities. Xidayang Reservoir with significant change of the land surface condition in the control watershed was chosen as the study area. The change trend,change point and type of the variation of the annual maximum peak flow series of the reservoir were detected using the hydrological variation diagnosis system. The peak flow series and designed peak flows of different frequencies corresponding to the past land surface conditions were calculated by the frequency analysis method for inconsistent hydrological series. The uncertainties of parameters of Type Pearson-Ⅲ distribution (P-Ⅲ distribution) were estimated by Markov Chain Monte Carlo (MCMC) simulation method, and 95% confidence intervals of parameters were determined. The hydrological frequency analysis was calculated based on the coupling of estimated parameter and curve fitting,then the estimates ranges of flood peak flow of design frequency after and before were determined. The indexes coverage rate,average bandwidth and average bias degree were chose to evaluate the optimal benign of estimates ranges. The results show that the revised coverage rate has increased by 17.10%,and the revised average bandwidth and average bias degree reduced by 15.77% and 3.27% separately. Thus, the reliability of predicted uncertain ranges was improved by consistency correction of inconsistency of hydrological sequences influenced by human activities.