The shieldbored tunnel section of phase 2 of line 10 of Beijing Metro crosses Kunyu river. The tunnel is located in sandy cobble strata. Technologies, including optimizing the boring parameters before rivercrossing, bringing the pressure in the excavation chamber, the driving speed of the shield machine and the muck releasing speed of the screw conveyor under effective control during rivercrossing, adjusting the grouting pressure, the grouting volume and the tail sealing grease volume, executing simultaneous grouting and secondary grouting, are applied. In the end, the shield machine crosses the river successfuly and the deformation of the riverbank is within the allowable range. The paper can provide reference for similar projects in the future.