Effects of ground limestone fineness on cement pastes were studied and the rheological properties of cement ground limestone pastes were determined through the rotating viscometer. The related rheological parameters were obtained by fitting paste rheological curves based on Herschel Bulkley model. The results show that new building energy and consistency decreases with the growth of ground limestone fineness, while dynamic yield stress increases at the same time. The growth of ground limestone fineness reduces the thixotropy of cement paste and slows the progression, and promotes the instantaneous structure recovery capability of cement paste. New building energy of cement ground limestone pastes decreases with test time, while consistency and dynamic yield stress increase.