With a new method of the oligomerization of dicyclopentadiene and clopentadiene, a high density hydrocarbon fuel tricyclopentadiene was synthesized with a yield up to 83.2%. The effects of catalyst amount, temperature, solvent on the reaction of TCPD was studied. Results show that the optimum conditions are the molar ratio of n(Ni(PPh₃)₂Cl₂):n(Zn):n(CPD)=0.05:0.6:1, reaction temperature 60 ℃, and reaction time 8 h. With respect to the Diels-Alder method, the oligomerization method has lower reation temperature and pressure (0.1 MPa), and higher yield.