In this paper, the initial marsh-time or fluidity (MF), loss rate of fluidity as time (FL), saturation point (SP), setting time (ST), and bleeding rate are considered simultaneously to evaluate the compatibility between a polycarboxylate high-performance water-reducing (HPWR) agent and cement. The comparisons of these parameters between tested concrete and reference cement are conducted, and the corresponding membership functions are established. Then, the fuzzy mathematical evaluation method based on Matlab is used, and the limitation of reference cement is broken, resulting in a more comprehensive and accurate evaluation. Both the premixed concrete and the cement paste, which use the same polycarboxylate HPWR agent, are evaluated as "the best" by the method proposed in this paper, and the consistency is acquired according to the performance experiment. Results also show that they have good correlation. The research findings can serve as guidelines in the preparation of green concrete made of HPWR agents.