The effect of paste thickness of coated aggregates on the rheological properties of fresh concrete was investigated using an ICAR rheometer. The results show that the paste thickness of coated aggregates can have a significant effect on the rheological properties of concrete. The yield stress, plastic viscosity and static yield stress of concrete gradually decrease with the increase of paste thickness of coated aggregatesunder the fixed parameters of aggregates. The slump gradually increases, thus improving the flowability. Ata specific water-to-cement ratio and a relatively high paste thickness of coated aggregates, the mixture shows a higher slump and the slight segregation appears. The optimum amount of cementitious materials can be determined by a relationship between rheological parameters and paste thickness ofcoated aggregates. It could be effective to guide the concrete mixture design by controlling the rheological properties of fresh concrete.