In order to grasp the movement law of soil water and solute in dual point source drip irrigation, and provide reference for the design and management of drip irrigation of navel orange in red soil hilly areas, a mathematical model for water and nitrate nitrogen transport in five different red soil bulk densities was established. With the help of Hydrus-3D model, the soil water and solute distribution characteristics and wetting front transition and confluence process were simulated under the different red soil unit weights, the same drip discharge and nitrogen application rate. The simulation results were in good agreement with the test results: the deviations of simulated wetting front migration and confluence process, wetting zone soil moisture content and NO-3-N content between the measured and simulated values were less than 9.5%;the simulated and measured values were in good agreement, and it showed that the confluence of soil moisture and NO-3-N content in the same depth was below the wetting front under the drip soil, and red soil in high density hindered the wetting front velocity. Overall，Hydrus-3D can be used to simulate the wetting zone and the transport and distribution of water and nitrogen under drip irrigation fertilizer irrigation and red soil irrigation.