Using Grubbs second-generation catalyst, the ring-opening metathesis polymerization (ROMP) reaction of dicyclopentadiene (DCPD) was carried out to produce poly(dicyclopentadiene) (PDCPD) with shape memory properties. The samples were characterized and tested by FT-IR, DSC, TGA, and a microcomputer-controlled electronic universal testing machine. The effects of catalyst content on curing time, gel content, and shape memory properties were investigated. The shape memory behavior of PDCPD in different high-temperature scenarios was explored. The results show that the prepared shape memory poly(dicyclopentadiene) samples have the maximum tensile strength of 51.0 MPa (3‰ catalyst dosage), the maximum glass transition temperature of 163.6 ℃ (5‰ catalyst dosage), and a thermal decomposition temperature of up to 420 ℃ . At a temperature scenario of 220 ℃ , the shape fixation rate and shape recovery rate both reach 99% , demonstrating the potential for application in high-temperature scenarios.