G403 anti-channeling toughener relies on the crack-resistance and toughening properties of composite fibers, the use of fiber to load transfer, so that the internal defects of cement paste stress dispersion, increase the impact resistance of cement stone; Which can improve the load capacity of visible crack of cement stone and prevent the stress cracking of cement stone. Under the action of load, the crack propagation can be prevented and the stress field of crack tip can be shielded under the strong impact load, so the toughness of cement stone is improved and the protection of oil and gas Layer, to prevent perforation caused by brittle defects. At the same time the product has a certain micro-expansion, to compensate for the cement slurry ( stone ) contraction, and produce a slight expansion of the volume is conducive to prevent oil, gas, water channeling.