Abstract: Making use of series model test, the local scour about the "lain abutment of Oujiang's second bridge were studied. The experiment results show that the maximum scour depth has relation to the runoff and the longitudinal axis trend of main abutment: the maximum scour depth is equal to 11. 69 m when the runoff is equal to 23 400m'/s (the runoff frequency is equal to 1 % ) and the longitudinal axis trend is parallel to the flow direction; it is 14.81 m when the included angle between the axis trend and the flow direction is 20 degree. The local scour and the erosion control measures about construction cofferdam of the main abutment are also studied.