Abstract: In order to study the influence of printed parameters such as nozzle travel speed and nozzle height on the mechanical properties of 3D printed concrete (3D PC), the same mix proportion of cast test blocks and printed test blocks with different printed parameters were prepared. Through concrete cubic compressive test, prismatic axial compressive test and cubic splitting tensile test, the failure process and failure mode were investigated, the influence of nozzle travel speed and nozzle height on the mechanical properties of 3D PC were analyzed, the axial compression stress-strain curve of 3D PC was obtained, and the relationships between the strengths of 3D PC were established. The results show that the cubic compressive strength, axial compressive strength and splitting tensile strength of 3D PC decrease with the acceleration of nozzle travel speed and the increase of nozzle height, and the adverse effect of nozzle height on strengths is stronger than that of nozzle travel speed. Under the optimal combination of printed parameters, the compressive strength of printed test block is higher than that of cast test block. However, due to the weak interlayer bonding surface of printed test block, the splitting section is at the interlayer interface, resulting in an obvious smooth section, and the splitting tensile strength is lower than that of cast test block. Through regression analysis, the functional relationships between the strengths of 3D PC and printed parameters, as well as the conversion relationships between axial compressive strength, splitting tensile strength and cubic compressive strength were established.