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We investigate dynamic pre-configured-cycle (p-cycle) protection design for spectrum-sliced elastic optical networks (EONs). Several novel algorithms are proposed to use the spectrum planning of working and backup resources. We first combine the protected working capacity envelope (PWCE) p-cycle design with spectrum planning, and design an algorithm that can achieve dynamic p-cycle design in EONs. Then, to resolve the coverage issue of the PWCE-p-cycles, we consider dynamic p -cycle design with Hamiltonian cycles and propose to use topology partition for reducing the lengths of backup paths. Simulation results show that our proposed algorithms achieve lower blocking probability than the shared path-protection (SPP) algorithm, while the average length of backup paths per request can be controlled well. To the best of our knowledge, this is the first attempt to address dynamic p-cycle protection design with spectrum planning for EONs.