The plane two-dimensional flow mathematical model is established by using the measured data of the multifunctional navigation mark，and the flow state of the river where it is located is accurately restored.The applicability and adjustability of the model are analyzed.The results showed that：1)The model has strong applicability.When the initial conditions and boundary conditions match or do not match，the model can use the measured data of multifunctional navigation mark to restore the flow state of the river.The water level error is below 10 cm，and the flow velocity error is about 0.2 m/s.The flow field restoration is also consistent with the actual situation.2)The model has good parameter adjustability.Under different circumstances，the model can be calibrated by fine-tuning local parameters according to the multifunctional navigation mark data.