Abstract
This paper presents the investigations on the historical arch-type stone-masonry bridges, carried out by the authors between 1994 and 1996 in Japan and China.
These bridges were built several hundred years ago and are still in use. Authors studied the actual examples of the damage and the repair of these bridges by classifying them based on the reasons of damage. And the structural characteristics of arch-type stone-masonry bridges were examined. Finally a technical discussion has been presented concerning the repair and conservation of arch-type stone-masonry bridges in the future.