The solar UV radiation and its influence factors (cloud, ozone, etc.) in Lhasa, Tibet, China were observed during the period of January 2015～December 2016 by using the NILU-UV Irradiance Meters. The results show that the daily mean UV dose during the period was 1.24 MJ·m-2·d-1, in which maximum value in summer (from June to August) was 1.57 MJ·m-2·d-1, minimum value in winter (from December to Feburary) was 0.87 MJ·m-2·d-1. The average local noon-hour (05:25～06:25 UTC) UV index (UVI) was 8.34 during the period, in which the average value in summer was 11.53, and 5.02 for the winter. UVI maximum value (20.78) and daily UV dose maximum value (2.58 MJ·m-2) both arose in August, 2016. There was a phenomenon that the UV radiation was strengthened in summer as the cloud exchanged richly. The total ozone column(TOC) almost had no change during measurement, and the average local noon-hour TOC value was 264.2 DU.