The model of a novel Optical Transport Network（OTN） architecture is set up in this paper

to which the signals from Ethernet clients are adapted by a new mapping procedure and transported over the model.It is proved by the comparison between the clock at the receiver end and the ideal clock that the new procedure has less effect on the OTN clock performance.This model and the resulted conclusion may help optical network system designers estimate and analyze the network clock performances and predict the possible effects of different mapping procedures on clock performances.