For construction of most tumulus, sandy soil and cohesive soil were alternately tamped down using method called the hanchiku method (a method of making the core of a podium), which was used to make the banking part harder, and according to surveys which were conducted during the repair of buildings of the Asuka and Nara periods, the method was generally used to develop a solid base of large buildings in ancient times.
墳丘の築造にあたっては、盛り土部分を堅固にするため砂質土や粘性土を交互につき固める版築工法で築成されるものも多いこと、こうした工法は飛鳥時代や奈良時代に大規模な建物の基礎を固める工法として広く使用されていることが、修繕時の調査などで判明している。