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Because of such shortcomings of melamine series water reducer as weak slump retentively, a slump retaining type melamine high-range water reducer was synthesized by adding p-aminobenzene sulfonic acid as modifying agent in this paper.The influences of its main reaction conditions on dispensability were researched and the optimal preparation conditions were established.Finally the structure of self-made melamine high-range water reducer was characterized by FTIR, and the dispersibility of which to cement paste and concrete was measured.