This products is mainly used for the series of polycarboxylate water-reducing agent. Through combination of free radical initiator and acrylic copolymer would be able to achieve excellent polycarboxylate agent. This products is easy soluble in water with high rate of double bond retention, the molecular structure is comb-shaped and has high degree of freedom so that it can be redesigned or manufactured by simple synthesis process to achieve high-performance water-reducing agent with characteristics of low dosage, high rate of water reducing, excellent enhancement, durability, anti-corrosion to steel and so on.