With the application of PTN in telecommunication networks, the feasibilities need to be studied much deeper about PTN transmitting relay protection services. In this paper, the characters of provider backbone transport (PBT) and transport MPLS (T-MPLS) which are the two key technologies of PTN are analyzed. By the analysis, the feasibilities about PTN transmitting relay protection services are discussed in the aspects of the standby LSP, time delay, TDM simulations, exchanging and so on. Firstly, the performance indexes of relay protection services are analyzed in four aspects —— interface rate, time delay, bit error and channel. Secondly, based on the time delay formulas, the study is focused on the sending/receiving delay and the forwarding and switching delay about PTN transmitting relay protection services. Some recommendations such as technology choice and routing configuration are given. Finally, how to choose linear protection switch is studied from the reliability standpoint. Related suggestion and scheme are given.