In order to obtain lubricant for drilling fluid with low fluorescence level and good lubricating performance，a lubricant BDLU-100L was prepared by white oil，high efficiency emulsifier，extreme pressure agent chlorinated paraffin and penetrant succinate sodium alkyl sulfonate. The properties of BDLU-100L，such as fluorescence level，emulsifying stability，lubrication，temperature tolerance and salt resistance，and the effect on the rheological and wall building properties of drilling fluid were studied. The results showed that the fluorescence level of BDLU-100L was lower than three level. BDLU-100L had good emulsifying stability，and could be used at 200℃ and saturated brine. The lubrication coefficient of fresh water drilling fluid was reduced more than 90% by 0.5% BDLU-100L，and that of seawater，compound salt water and saturated brine water drilling fluid was reduced by 82%，73% and 71% respectively with 3% BDLU-100L addition，showing good lubricity. BDLU-100L had little effect on the rheological properties of fresh water drilling fluid and high temperature and high density drilling fluid. It applied to the high brine and high density drilling fluid below 200℃.