Turpentine-based dipentene (TBDP) contains limonene 30.32 %, terpinolene 31.35 %, α-terpinene 7.55 %, γ-terpinene 6.40 % and p-cymene 12.87 %. Three Pd/C catalysts were characterized by BET, XRD, TG-DTG and atomic absorption spectrometry (AAS). The properties of the catalysts on TBDP conversion were compared. Difference of catalytic competitive reactions of TBDP by catalyst A with the change of reaction temperature was discussed in detail. The yield of p-cymene at 280-310°C was over 95.0 %. It was important to control the reaction temperature for TBDP dehydrogenation catalyzed by Pd/C catalysts. It is valuable to probe the catalytic behaviors of Pd/C catalyst on TBDP dehydrogenation for research and development of efficient preparation technology of p-cymene from TBDP.