Phosphor layer is solidified by ultraviolet (UV) radiation. Experiments are done on various components of UV glue to study the influence of curing on the film transmittance. The best matching ratio to get the highest transmittance is obtained. Mixing phosphor with the best proportion of UV glue, the phenomenon of phosphor sedimentation is observed and it is compared with that of the traditional glue. The optical performance of LED respectively packaged by UV glue and AB glue are measured. Through the measurement results, the influence of UV curing on LED optical performance is analyzed. It is found that the phosphor sedimentation phenomenon is more obvious in the AB glue than that in the UV glue. While compared with AB curing LED, the UV curing LED has no significant discrepancy on the optical properties such as the distribution of the LED spectrum, color rendering index, correlated color temperature and luminous flux.