Catchment hydrological models are of vital importance in regional water resource assessments.In this study,based on the Princeton Meteorological Forcing Dataset and the recorded runoff data at eight hydrometric stations on the Lancang-Mekong River,the hydrological characteristics of the eight sub-regions were analyzed.The regional runoffs,as well as other key water balance components,were successfully simulated using an RCCC-WBM model.The obtained results revealed that the Lancang-Mekong River Basin was characterized by high differences in hydro-meteorological features.For example,the temperature levels in the upper reaches were much lower.However,those areas displayed larger ranges of seasonal variations.Meanwhile,the temperature levels in the middle and lower reaches were higher,with narrow variation ranges in seasonal temperatures.In addition,the seasonal patterns of the runoff were generally consistent with that of the precipitation,with one-month lags in runoff peaks occurring.This study's RCCC-WBM model was able to effectively simulate the monthly runoff patterns for the sub-regions of the Lancang-Mekong River Basin,with Nash-Sutcliffe coefficients over 60% in both the calibration and validation periods.The model achieved a relative error of runoff volume varying in a range of ±10%,which indicated the suitability of the model for studying catchments.The seasonal patterns of the simulated soil moisture were found to be characterized by first decreasing trends and then increasing trends,followed with decreases again due to influencing effects of seasonal variations in precipitation and evaporation.The main water sources for the runoff yields and the actual evaporation consumption values were observed to change with the different seasons.It was determined in this study that precipitation was the main source of the runoff yields and evaporation during the flooding seasons,while soil moisture played an important role in providing resources for both consumption processes during the dryer seasons.