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When a longer longitudinal bracket laid on a shorter longitudinal bracket in a bracketing set, the appearance is usually recognized by an inverse triangle. It is because one recognizes an immanent oblique line that connects the end parts of the longer bracket and the shorter bracket. The slope of the oblique line between the longer bracket and the shorter bracket has the approximate value of √2/1 which is a kind of dynamic symmetry in the bracketing set of Ying Zao Fa Shi. The oblique line exists in the bracketing set design of Ying Zao Fa Shi.With this paper, the cases whose slope is the approximate value of √2/1 was found in the Dapo Bracketing Set in Late Goryeo Dynasty and Early Joseon Dynasty. This is a verification that the oblique line exists also in the Dapo Bracketing Set design, like Ying Zao Fa Shi. However, it differs from Ying Zao Fa Shi in that the inverse triangle is not extended in the wall of a bracketing set. If we investigate the case which resembles the oblique line of Ying Zao Fa Shi most in the Dapo Bracketing Set in consideration of the level by which the inverse triangle is extended, three, Haeju Simwonsa Bogwangjeon#1, Seoul Namdaemun#3 and Pyeongyang Botongmun#2 will be mentioned. In these, it is verified that two of the former resemble most also in the rate of member in Ying Zao Fa Shi. This has proved that the the two former oblique lines appear in the thing of Ying Zao Fa Shi similar. And the oblique lines whose slope are dynamic symmetry other than value of √2/1 exists in the cases of the Dapo Bracketing Set. The slope different from the thing of Ying Zao Fa Shi exists in the Dapo bracketing set design. And in the Dapo Bracketing Set, there is a tendency that the three ends parts of the longer bracket and the shorter bracket and capital block align themselves in a strait line-a oblique line. Although such a tendency is a few, it has a design-meaning only by itself.