Experiments of mixing barium/strontium sulfates scale formation, as well as effects of reaction time, temperature, stirring rate, concentration of Ba2+/Sr2+ and SO42- on the formation of barium/strontium sulfates scale at L95 and T9 production sites in Linpan oil production factory of Shengli oilfield, were investigated in the paper. The results showed that the scaling rate of barium/strontium scale was basically stable in ten minutes. The scaling rate of BaSO4 was above 98%, while that of SrSO4 was about 22%. Reaction time and stirring rate had no effect on the scaling rate of barium/strontium sulfates scale, while the temperature (30—80℃) and the concentration of Ba2+ had a little influence on the scaling rate of BaSO4. The scaling rate of BaSO4 increased with increasing SO42- concentration, and that increased from 94.68% to 99.97% when the concentration of SO42- increased from 1.53 mmol/L to 3.06 mmol/L. The scaling rate of SrSO4 had greatly increased with increasing temperature as well as the concentration of SO42- and Sr2+. When the concentration of SO42- and Sr2+ increased to 24 mmol/L and 3 mmol/L respectively, the scaling rate of SrSO4 scale was nearly to 80% at the temperature higher than 80℃. Besides, When the concentration ratio of [Ba2+], [Sr2+] and [SO42-] was 2:1:6, the total scaling rate of mixed barium/strontium sulfates scale was as high as 93.75%. Because of the addition of 6 times concentration of SO42-, the total scaling rate of barium/strontium sulfates scale was about 91% with 20 min scaling time by using the continuous point scaling technology. In general, it was an effective way to improve the scaling rate of barium/strontium sulfates scale by increasing SO42- as scale accelerator.