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Naphthalene sulfonate formaldehyde (NSF) condensate plasticizer performs negative effect on the dispersing property in cement paste containing PCE superplasticizers.A series of blended solutions with different mass ratios of PCE to NSF from 1% to 99 % wt were studied.The actual viscosity of blended solutions was much higher than the theoretical data especially for the NSF solutions added low mass ratio of PCE polymers.The addition of NSF polymers increases the surface tension of PCE superplasticizers while PCE polymers decrease the surface tension of NSF solution.NSF polymers didnt show obvious impact on the initial fluidity of cement paste containing PCE superplasticizer but the flow spread of cement paste declined sharply when the mass ratio of NSF up to 7% wt.The fluidity of cement paste containing NSF plasticizer with low mass ratio of PCE superplasticizer showed significant decrease at the mass ratio of 5 % wt.