A three-dimensional point-type Doppler velocimeter(ADV)is used to measure the flow field in the spur dike area,and a high-precision force balance and a digital strain data acquisition instrument are used to measure the longitudinal and transverse two-dimensional force conditions of the ship model at different positions in the spur dike area under different flow velocities.On this basis， the force characteristic of the ship navigating in the spur dike area is analyzed， and the navigation safety of the ship near regulating structures is investigated from the force perspective.The experimental results show that when the ship passes by the spur dike， the transverse force will have a forward(thrust)peak and a reverse(suction)peak.The forward(thrust)peak appears at the position where the ship center is moved upstream of the spur dike in the range which is 0.56～0.67 time of the ship length;the reverse(suction)peak appears at the position where the ship center is located downstream of the spur dike in the range which is 0.11～0.44 time of the ship length;the longer the transverse distance between the ship and the dike head is， the later the extreme value will appear.The extreme value of longitudinal force appears at the position where the ship center is located downstream of the spur dike in the range which is 0.065～0.28 time of the ship length;as the approaching flow velocity increases， the extreme point tends to evolve downstream.