Indonesian bitumen and sands were thoroughly separated from Indonesian oil sands by introducing organic solvents and aqueous reagents into the system. The reaction mechanism of the double phase extraction system on the separation of oil sands was deeply analyzed. The effects of amount and pH of the aqueous reagents, amount of solvents and temperature on the bitumen recovery from oil sands were also investigated. The results showed that under the optimum operation conditions of m(aqueous reagents): m(oil sands) 0.4-0.6, pH of aqueous reagents 10-12, m(solvents): m(oil sands) 1.0 and temperature 70 degrees C, bitumen recovery could be 94.5%. Bitumen recovery by double phase extraction was improved remarkably compared to single phase extraction.