Abstract: In order to study local scouring field near the pier with sediment control dam,the 3-D velocity field of the pier in monomer model is subtly measured by ADV velocimeter of Sontek.This paper analyses the velocity distribution in the scouring pool of pier and takes turbulent strength distribution in different direction.Three new characters for the local scours of piers with the sediment control dam are analyaed and the dam's applicability is brought forward.The flow field near the pier is simulated by the 3-D mathematical model with FCVM,and the computing resuts have finer coherence compared with the measured value of ADV.The characteristic of the 3-D velocity distribution in front of piers and its influence on the local scour of the pier are studied in detail with the data from the measurement and simulation.It is very useful to analyae thoroughly the flow field structure of piers with the complex boundary and the local scouring theory.