This paper is the third report of the automachic design for port and harbour structures, which is developed under the Design Standard Division.
　This report presents the Automatic Design System for Bar Arrangement of the Caisson (ADSBAC) being used as quay-walls or breakwaters.
　Using this system, we are able to obtain the results of the calculation of bar arrangement, the total amounts of bar and bar arrangement drawing.
　This paper presents the outline of ADSBAC, the comparison of results between ADSBAC and the method which have been used, and how to use ADSBAC.