This study was focused on preparation technology of the high range water reducing agents of polycarboxylic series with allyl alcohol polyoxyethylene, acrylic acid, maleic anhydride and Sodium methyl acrylamide as the main raw material. Various factors influencing performance of water reducer were exploited and optimum technologies of the water reducer were obtained. Furthermore, tests were made on properties of the reducer.The result shows that this water reducer has the features of small dosage, good dispersibility and high water reducing rate. At the solid dosage of 0.25%, the original fluidity of cement paste with this water reducer can attain 310mm,and the waterreducing rate reaches 30.5%. Also, this water reducer can remarkably enhance the strength of concrete and be used to prepare high performance concrete．