To renew an abrasive cloth for a lift-feed polishing machine with an economical condition.

A judgment of a solid degree of the abrasive cloth can be easily carried out by everybody. Thereby, a management of the abrasive cloth is realized such that the situation that an economic defect is generated since a renewal timing is too earlier does not occur and the situation that a deterioration of the polishing ability is generated since the renewal timing is too late does not occur. For example, a pattern comprising a color assuming a color of the state that an exchange timing of the abrasive cloth has arrived since it is solid by its use is provided on a surface of the abrasive cloth 2 constituting a polishing panel 1. When the soiling of the abrasive cloth 2 is advanced and a ground color of the abrasive cloth becomes in the state that a contrast of the pattern and the ground color is reduced and hardly seen as shown in Fig. (c) via Fig (b), it can be judged that the exchange timing has arrived.