The work is devoted to identifications of dynamics of cicling wear process.The experimental realization of the problem has been carried out wirh use of tribometrical system Tribal-2.The circuit of contact interaction coupling has been analyzed.The offered method given us an opportunity to consider a process of wearing as process with one input and one output. The usage of aimular approaches allows to receive a transfer function of wearing process.The details of theoretical substantiation of the method and a new approach in modeling have been given.The results of experimental-analitycal researches have shown,that the use of system dynamic characteristics allows to establish top and bottom borders of treated surfaces' quality in real time.There is a correlation of dynamic estimations of surfaces' quality with measured profilogrammes.