One of the important parts of large pump station is front basin, through which upstream flow is delivered to downstream place. Because of great values of land resource in modern cities, occupied area of pump station is strictly limited usually, designers have to choose a somewhat non-normal form for front basin, that is, short length and large diffusion angle in flow direction. However, such ... [Show full abstract] arrangement will intensify disadvantageous flow condition, non-uniform flow distribution among operating pumps, power consumption of pump station and sedimentation of sand. Through hydraulic model test research for SB Pump Station in Shanghai Sewage Treatment Project II, paying attention to above-mentioned disadvantageous conditions especially, this paper presents a new technique: flow guide combination of depressed plate and guide piers, which has significantly improved flow condition in front basin and uniformity of operating pump's flow rate, so that can enhance pump station efficiency and eliminate sand sedimentation. This hydraulic optimum technique has been applied to several pump stations.