Abstract: Synthesized HG-2 oil drag reducing agent (DRA) by a new controllable pre-polymerization technology was prepared. The polymer average molecular weight is greater than 3.0?106. Performance evaluation, bench test and road test of diesel fuel with 50 mg/L DRA were conducted. Results show that adding 50 mg/L DRA into diesel fuel has no obvious influence on the vehicle performance and the quality can conform to the GB 252-2011 national standard. Field experiment in oil pipeline was conducted. The delivery rate increase of diesel with DRA10 mg/L can be up to 30%. With 8 mg/L DRA, at Reynolds number of 52411, 70940 and 78087, the corresponding delivery rate increase is 26%, 30.2% and 38.6%, respectively.