Monofilament Fiber is a kind of high strength monofilament micro fiber made of polypropylene, which could effectively prevent concrete micro-crack, as well as improve concrete performance of anti-crack, anti- infiltration, anti-concussion and anti- shock. This fiber is produced by special technology, the products with many fiber mono-filaments, when the fiber is put into the concrete, the horizontal structure in fiber monofilament can be destroyed in the course of stirring owing to friction and rubbing, and the fiber monofilament will fully stretch, thus the concrete is reinforced by a great number of polypropylene fibers.