To investigate the factors influencing the mechanical performance of precast spliced slotted ultra-high performance concrete （UHPC） columns under eccentric compression， two fully cast UHPC columns and fourteen precast spliced slotted UHPC columns were tested under axial or eccentric compression loading with different splicing forms， different eccentric compression directions， and different eccentricities. The influence of splicing forms， eccentric compression directions， and eccentricities on the static performance of the specimens is analyzed by investigating the ultimate carrying strength， failure modes， and axial and lateral deformation capacity. The results indicate that steel fibers can prevent premature cracks of UHPC and enhance the deformation capacity of the specimens， but the precast spliced slotted UHPC columns exhibit significant brittle failure characteristics under axial and eccentric compression load. In this experiment， the failure modes mainly divide into the compression failure mode for small eccentricity and tension failure for large eccentricity. The columns with different splicing forms and eccentric compression directions have similar behavior under the same eccentricity. The ultimate carrying strength of precast spliced slotted UHPC columns decreases with the increase of eccentricity under the same section dimension and reinforcement ratio. Finally， the limitations of the current Chinese codes are pointed out qualitatively by comparing the experimental ultimate carrying strength with the theoretical values by referring to the current Chinese codes. The test date in this paper can provide a reference for precast spliced slotted UHPC column design.