Abstract: To examine the performance of the drag reduction reagent produced by polyolefin catalyst, an aging process was used to treat the polyolefin catalyst TiCl4/MgCl2 and promoter Al(i-Bu)3. And then the drag reduction performance of polymers produced by aged catalyst (and non-aged) was tested in an indoor loop evaluation device at different concentrations of TiCl4/MgCl2 and promoter Al(i-Bu)3. The effect of aging temperature and aging time on the drag reduction performance of polymer by both catalysts was surveyed. IR and XRD were used to characterize the prepared polymer structure. The results show that the drag reduction rate of polymer using aging catalyst is greater than that of nonaging one when the TiCl4/MgCl2 dosage is in 5.97×10-4mol/L to 11.09×10-4mol/L and the Al(i-Bu)3 dosage is more than 4.29×10-2mol/L and that as the polyolefin catalyst dosage increase, the drag reduction rate increases first and then decreases. The polymer having maximum drag reduction rate is obtained at the aging temperature of - 2 ℃and 10 min. Drag reduction rate can reach to 50%. The IR and XRD results show that the aging process haven’t change the structure of polymer product but makes its crystallinity decrease. Key words：catalyst; aging; drag reduction rate; drag reduction agent; polyolefin