Abstract: A high performance drag reduction agent was synthesized by bulk polymerization of cyclopentadiene/α-octene /α-dodecene using TiCl3/AlEt2Cl as trigger. The impact factors on polymerization were investigated, such as pretreatment of raw materials, raw material composition and temperature. After the polymerization conducted under the conditions: water content of raw materials less than 30ppm; mole ratio of n(cyclopentadiene): n(α- octane): n(α- dodecene )=1:1:1; TiCl3 3 mg/L; mole ratio of n(TiC13):n(AlEt2Cl)=1:25，reaction temperature 0-5 ℃, reaction time 72 h, the reaction product was placed at room temperature for 2 days , the polymer molecular weight can be up to 6.4×106. The results of loop drag-reduction test of the agent indicate that drag reduction rate for diesel reaches to 48.3% at 10mg/L the polymer concentration.