The effects of mixing durations (120, 210, 300 s) and superplasticizer addition methods (direct or delayed) on rheological properties, pressure bleeding rates, and lubrication layer characteristics of high-performance concrete (HPC) were investigated. And the effects of mixing procedures on pumping properties of HPC were further evaluated. The results show that the flowability of HPC is enhanced by properly prolonging the mixing duration and the delayed addition of superplasticizer. Besides, it needs a longer mixing time to reach the optimum flowability state for mixtures with a larger paste to aggregate ratio. In a certain range, the increasing mixing duration reduces the pumping pressure loss of HPC, but it increases the pressure bleeding rate of HPC, reduces stability of HPC during pumping and increases potential risk of blockage during pumping. Under different mixing procedures, both the viscosity constant of lubrication layer and the bleeding volume at 140 s are well correlated with the pumping pressure loss of HPC, serving as reliable indicators to evaluate the pumping performance of HPC.