Abstract: By introducing amphiphilic balance (P0)，hydrophilic balance (k)，and amphiphilic matching coefficient (l)，the amphiphilic balance and comb-shaped copolymers of the polycarboxylate superplasticizer were investigated. The result showed that in the viscosity range (1.28－1.32)，hydrophilicity and hydrophobicity of polycarboxylate superplasticizer of methacrylic acid showed a linear relationship：y=0.6327x+0.5078(R2＝0.9535)，amphiphilic balance P0＝0.5078，hydrophilic balance k＝0.6327. Under specific condition，the calculated matching coefficient could be used to predict the dispersing ability and monomer matching before synthesizing the copolymer.