Time Petri nets with priorities are a widely studied model for real-time systems. The intention of the paper is to develop an algorithm for parametric timing behaviour verification of real-time and concurrent systems represented by prioritized time Petri nets (PrTPNs). To achieve the purpose, we introduce a notion of the parametric PrTPN which is a modification of the PrTPN by using parameter variables in specification of timing constraints on transition firings. System properties are given as formulae of a parametric extension of the real-time branching time temporal logic TCTL, PTCTL. The verification algorithm consists in constructing conditions on timing parameter variables under which the PrTPN with bounded parameters works w.r.t. the checked PTCTL-formula. We have also shown the correctness and evaluated the complexity of the algorithm proposed.