Abstract: To prevent sands production is one of the critical operations in the loose reservoirs. Generally, it is not enough to take mechanical or chemical sand-prevention methods for those high sand production wells, resulting in replacing the sand-prevention tubings. This paper presents a novel technology to use high pressure rotary water jet to remove the blockage of slotted tubings downhole. We designed the blockage-removing tool, and had experiments about the relationships between its rotary speed and pump pressure, the nozzle’s impacting force etc. In addition, we simulated the tool’s performance under practical conditions. The field application on over 10 wells proved this technology feasibility and effectiveness.