Abstract: Water jet soil reaming parameters were analyzed based on the water jet theory and the soil mechanical theory. Some re-lationships between water-et parameters and soil parameters were established. The effects of water jet parameters and drill motion parameters on the soil reaming were investigated by an indoor test. The experimental results show that it is necessary to increase water jet power for enhancing the soil reaming effect. Increasing the water jet flow quantity has more obvious effect on the reaming than increasing the water jet pressure while the water jet impact force exceeds the soil critical breaking force. Reasonable matching the rotation speed and vertical speed of the drill pipe has more favorable effect on the soil reaming. It is feasible through engineering application that the water jet soil reaming technology is applied to making multi-ring type anchors in engineering, and the bearing capacity of the anchors is significantly improved.