This paper deals with the preservation of Onoda Bottle Kiln which was built in Taiheiyo Cement Factory in Onoda City. October 2000, the excavation started around the kiln so that three clay brick masonry foundations connected with the existing kiln and two small foundations in the east and one foundation in the west were found. And many brick masonry units and prisms were also found in this investigation. From results of uniaxial compression tests about these units and prisms, it was clarified that the brick masonry units and prisms used for Onoda Bottle Kiln had large capacity of deformation. And it was also clarified of this kiln.