1,Provide Mechanical Power: The drill rods are driven to rotate by the drill rig, providing mechanical power to the drill bit, enabling it to cut and drill into the rock layers.

2,Transfer Drill Bit Torque: The drill rods transfer the torque generated by the drill rig to the drill bit, allowing the bit to apply cutting torque to the rock.

3,Support Drill Bit Weight: The drill rods can withstand the weight of the drill bit and its accessories, providing support for the cutting of the drill bit in the rock layers.

4,Transport Drilling Fluid: The hollow interior of the drill rods can be used to deliver cooling and lubricating drilling fluid to the drill bit, while also removing the rock cuttings from the borehole.

5,Directional Control of Drilling: Properly configured drill rods can effectively guide the drill bit, controlling the direction and inclination angle of the borehole.

6,Extend Drilling Depth: By continuously adding more drill rods, the drilling and core sampling can reach deeper rock formations.