Laser cleaning is mainly a method in conservation which is becoming recently employed in operative tests to remove alteration layers from the surface area of stone artefacts, as statues, architectural components and decorations inside the facades of historical buildings. This method exhibits potential benefits, that consist of controlled and selective cleanup operations.Laser cleanings can be used to determine the optimum laser parameters.Laser cleaning stone contains the optical characterisation using the stone surface, which include alteration layers and patinas. In other words, the response using the stone to minimal energy laser irradiation must acquire determined in conditions of absorption and expression of laser energy, so which you can quantify the fraction that is properly transferred in the direction of materials and is also utilised within cleanup process.