CsLiB6O10(CLBO) is a highperformance nonlinear optical crystal, particularly suitable for highpower ultraviolet laser by fourth harmonic generation (FHG, 266 nm) and fifth harmonic generation (FIHG, 210 nm). A CLBO crystal with the size of 120 mm×112 mm×62 mm was successfully grown using top seeded solution growth (TSSG) method in this work. The grown CLBO crystal exhibits a complete appearance without macroscopic defects such as cracking and visible scattering particles. A CLBO FIHG crystal component was cut from this crystal, and its UVvisiblenear infrared transmittance, optical uniformity and weak absorption properties were analyzed in detail. The results include that， the mean transmittance exceeds 90% from 210 nm to 1 800 nm, optical uniformity result is 3.8×10-5 and the weak absorption is 90×10-6 cm-1 at 1 064 nm. All of these results indicate that the asgrown CLBO crystal possesses good transmittance in the ultraviolet region, high optical uniformity and low weak absorption, laying the foundation for subsequent research on related applications.