Abstract: A dualistic hydrological cycle model(abbreviated as dualistic model) is developed orienting the natural-artificial dualistic characteristic of hydrological cycle in the Haihe River Basin(HRB) under the strong impacts of human activities,which consists of the distributed watershed hydrological model(WEP),the water resources rational allocation model(ROWA) and the multi-objective decision model(DAMOS).A two-layered coupling technique is adopted to realize the function for integrated water resources management analysis.The HRB is respectively partitioned into 11 752,125 and 8 application units for the execution of WEP,ROWA,and DAMOS.The dualistic model is calibrated and validated using the observations from the HRB.The result shows that the simulated evapotranspiration,river flow,flow discharge into the sea,and groundwater flow filed compare well to the observations,which demonstrates the potential of using the dualistic model for scenario analysis of water resources planning and management in the HRB.