The intake discharge and sediment concentration of a model need to be controlled in sedimentation model experiment. According to the sandsupplying mode, the sandfeeding system can be divided into watersand separate type and watersand mixed type. In the experiment of the watersand mixed sandfeeding system, there is a large control delay problem, because the sediment concentration can’t change with discharge rapidly. This paper introduces the control procedure and technological features about the two types of sandfeeding system. It puts forward an improved sandfeeding method by which sands are complemented at inlet. The new method has characteristics of the watersand separate sandfeeding system, and also solves the delay which exists in the watersand mixed sandfeeding system, thus improving the accuracy of the sediment concentration control and automation of the model.